SEAOURA Aquarium Range: 12 Listings by Tank Length, Watts and Gallon Band

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The seaoura aquarium range in this roundup has 12 listings: eight lights, two heaters, a submersible thermometer and a magnetic glass cleaner that also reads temperature. A person typing “seaoura aquarium” usually wants to know which item fits a tank they already have, and whether the listing gives a figure they can rely on. This guide groups the 12 listings by job, works through the light and heater arithmetic the listings allow, and says where the listings disagree. Where a title and the bullets differ, the text follows the bullets and says so.

Quick answer

• Read the tank length in the title first. The light listings cover tanks from 7 inches up to 27 inches, and only two of them also state a gallon band in their bullets.
• Three submersible lights share the model number SR-619 but state 5, 9 and 14 watts. Confirm the wattage on the box before you buy any of them.
• Two heaters are listed: a 25 watt unit for 1 to 6 gallons and a 50 watt unit for 5 to 15 gallons. For a tank under 5 gallons, the 25 watt unit is the only one whose band reaches that size.
• Both plant lights in the 12 to 24 inch group are listed as not water resistant in their specification fields. Keep them out of the water.

What the SEAOURA range covers

The 12 listings sort into four groups. Eight are lights, two are heaters, one is a submersible thermometer, and one is a magnetic glass cleaner that also reads temperature. Table 1 sets out the groups using only what each listing states.

Group	Listings	What the listing is built for
Full spectrum and plant lights	4	Planted tanks, with timers, dimming and color settings
Submersible lights	3	Lights that sit in the water on suction cups, for tanks from 7 to 27 inches
Clip-on light	1	A 7 to 12 inch planted tank, with a clip mount
Heaters	2	A 25 watt unit for 1 to 6 gallons and a 50 watt unit for 5 to 15 gallons
Thermometer and cleaner	2	A digital submersible thermometer and a battery magnetic cleaner with a temperature readout

The table is not a ranking. The groups are covered in the order below, and none is better because it appears first.

Light model numbers that do not match their wattage

The model number is the one field where the light listings line up, and it is also where they disagree most. Table 2 lists each model number with the wattage its listings state.

Model number in the listing	Listings	Wattage each listing states	Tank length in the title
SR-657	2	20 watts and 14 watts	18 to 24 inches; 12 to 18 inches
SR-616	2	14 watts and 10 watts	18 to 24 inches; 12 to 18 inches
SR-619	3	14 watts, 9 watts and 5 watts	27 inches; 15 inches; 7 inches
SR-617	1	12 watts, with a 10 watt maximum compatible wattage	7 to 12 inches

For SR-619, the three listings share the same bullet text word for word. Their titles give three sizes, and their specifications give three wattages. The bullets do not give a wattage at all, so the specification field is the only place a buyer can check the power. The 15 inch light’s specification also lists a maximum compatible light source wattage of 90 watts, against a 9 watt light source. The listing does not explain the 90 watt figure, so do not use it as a capacity figure.

The two SR-657 lights and the two SR-616 lights are a different case. Each pair is sold at two sizes, and each size carries its own wattage, which is what you would expect. The conflict is inside the SR-619 group, where one model number covers three sizes and three wattages with no explanation.

Choosing a light by tank length

Tank length in the title is the only sizing field most of these listings give. Only two lights add a gallon band in their bullets: the 12 to 18 inch full spectrum light states 2.5 to 15 gallons, and the 18 to 24 inch full spectrum light states 10 to 20 gallons. Table 3 sets each light against its title length and its mount, using the specification field for the mount.

Tank length in the title	Light, by model and wattage	Mount per specification	Note from the listing
7 inches	SR-619, 5 watts	Suction cup	Three light sources; bullets give IP68
7 to 12 inches	SR-617, 12 watts	Clip	10 watt maximum compatible wattage; 90 day warranty
12 to 18 inches	SR-616, 10 watts	Tabletop	Not water resistant; 1 month free return
12 to 18 inches	SR-657, 14 watts	Adjustable bracket	2.5 to 15 gallons in the bullets; IP68 in the specification
15 inches	SR-619, 9 watts	Suction cup	90 watt maximum compatible wattage in the specification
18 to 24 inches	SR-616, 14 watts	Tabletop	Not water resistant; 10 light sources in the specification
18 to 24 inches	SR-657, 20 watts	Adjustable bracket	10 to 20 gallons in the bullets; 12600 Kelvin color temperature
27 inches	SR-619, 14 watts	Floor mount	Bullets describe suction cups instead

Choose the light whose title length matches your tank, then check the mount. The 27 inch light is the clearest case of a mismatch. Its specification says floor mount, while its bullets describe suction cups and mounting under the hood or on the lid. Ask the seller which one applies before you rely on either.

Measure the tank length yourself as well. The bullets for the 18 to 24 inch light say it fits “18-24 inch tanks (10-20 gallons),” and the bullets for the 12 to 18 inch light say “12-18 inch tanks (2.5-15 gallons).” Those are the maker’s bands. The two gallon bands overlap between 10 and 15 gallons, so where they overlap, the tank length in the title still decides the choice and the gallon band only confirms it.

The plant lights are a separate choice. The UF/IFAS guide on the ornamental fish trade says: “Proper lighting is essential for the health of all animals, plant life, and also for aesthetic reasons.” That supports lighting as a category. It does not show that one SEAOURA wattage grows plants better than another. The earlier comparison on this site, Pawfly vs SEAOURA: Aquarium Lights compared, covers a related question about these lights.

Submersible lights and the suction cup mount

The three submersible lights describe the same feature set. Each has an IP68 rating in its bullets, silicone suction cups, a 10 level brightness control, three timer settings of 6, 10 and 12 hours, and a memory function that restores the previous setting after a power cut. The bullets say each light “can be fully submerged in the water.” That is the strongest claim in the group, and the listing does not describe how the rating was measured.

The electrical rule still applies. The CPSC shock guidance is written for pools and spas, but its plain line on electrical products is the right default for a light that sits in a tank: “If an electrical product falls into the water, unplug it before touching it.” Unplug a submersible light before you reach into the tank to move it, adjust a suction cup or clean the glass. The same guidance says to keep “electrical cords, wires, and products out of reach and at least 5 feet from the water,” which is a useful rule for the power block and the cord even when the light itself is meant to be underwater.

The bullets also add a detail that is easy to miss. Only the 15 inch light gives a beam angle, 10 degrees, and that figure appears in its specification field alone. The bullets do not give a beam figure for any submersible light, so the beam angle is a maker’s number.

Heaters: watts per gallon

The two heaters are the clearest check of the gallon band in this range, because each one states its band in the title and again in the bullets. Table 4 divides each wattage by the top and bottom of its band.

Heater	Gallon band, title and bullets	Watts	Watts per gallon at the band’s bottom	Watts per gallon at the band’s top
25 watt heater	1 to 6 gallons	25	25 ÷ 1 = 25	25 ÷ 6 = 4.17
50 watt heater	5 to 15 gallons	50	50 ÷ 5 = 10	50 ÷ 15 = 3.33

Table 4 shows that a 5 gallon tank sits in both bands. At that size the 50 watt heater gives 50 ÷ 25 = 2 times the rated watts of the 25 watt heater, and its watts per gallon is 10 against 5 for the smaller unit at 5 gallons (25 ÷ 5 = 5). Choosing between the two therefore comes down to whether you want the smaller or the stronger rating for the same tank.

The listings do not give a watts-per-gallon target, and the UF/IFAS setup guide gives no heater rule. These ratios compare the two SEAOURA listings with each other and nothing more. The setup guide does describe what to do after a heater goes in. It says, “The heater should be added next,” and then, “It should not be plugged in for an hour and then a full twenty-four hours should be allotted to allow the temperature to stabilize.” Allow a full day for the temperature to stabilize, as the setup guide describes, before you add fish.

For a betta, the temperature point comes from FA212, the UF/IFAS betta guide: “As mentioned, bettas thrive in warmer water and do not do well in cold water.” A heater that holds a steady temperature is the practical answer to that point, and the listings describe a set-point controller with a digital display for both heaters. For other betta heaters, see the best betta water heater guide on this site.

The bullets describe the safety features for both heaters in the same words. An overheat protection function stops heating when the water is too hot or too low, and the display reads “HH” when the water passes 99 degrees Fahrenheit. The bullets also say the heating rod must be “fully immersed in the water” and that the unit is “Rated at 110-120 V.” The cord is 4.2 feet long, and the heater is 4.7 inches long. The phrase “explosion-proof quartz heating tube” is the maker’s own. The listing does not explain it, so this article treats it as a claim.

Thermometers and the magnetic cleaner

The submersible thermometer and the magnetic cleaner both read water temperature, but they work in different ways and at different speeds. Table 5 compares them using the listing figures.

Item	Range per listing	Response time per specification	Power per listing	Warranty per specification
Submersible thermometer	32 to 122 degrees Fahrenheit	2 seconds	Wired, with a 6.56 foot USB cable	Lifetime warranty
Magnetic cleaner with thermometer	0 to 99 degrees Fahrenheit (bullets)	20 minutes	Battery, with a CR2032 included	Lifetime warranty

The response times are far apart. A 20 minute response is 1200 seconds, and 1200 ÷ 2 = 600, so the magnetic cleaner’s readout takes about 600 times longer to settle than the submersible thermometer’s. That difference matters most when you adjust a heater and want to see the change at once. For a quick check, the submersible unit is the better fit.

For other thermometers aimed at betta tanks, see the best betta fish thermometer guide on this site. The submersible thermometer’s bullets describe an “ultra-low 5V voltage” and a fully enclosed circuit board with “embedded potting technology.” It is listed for fresh and salt water, and it has a calibration function. The bullets do not say how the calibration works. The magnetic cleaner’s bullets say it is for glass tanks with a thickness less than one half inch, and that it is not suitable for acrylic or plastic. It is recommended for tanks of 1 to 30 gallons, and its accuracy is given as plus or minus 0.9 degrees Fahrenheit.

Electrical checks for the corded items

Most of the SEAOURA set is corded. The lights, both heaters and the submersible thermometer plug into a wall outlet, so the electrical rules apply to every item except the magnetic cleaner. The CPSC guidance says: “Keep electrical cords, wires, and products out of reach and at least 5 feet from the water.” It is written for pools and spas, so read it as a default rule for home aquariums rather than a code requirement.

Three practical checks follow from the listings. First, make sure the cord reaches the outlet without strain, since the heater’s cord is 4.2 feet and the thermometer’s cable is 6.56 feet. Second, do not reach into the tank while a corded item is plugged in. Third, if an item falls in, unplug it first, because the CPSC guidance is direct on that point: “If an electrical product falls into the water, unplug it before touching it.” These are general checks; none of the listings sets out a safety procedure beyond its own bullet text.

How we chose

This roundup covers every SEAOURA listing in the research record, which holds 12. We did not select a subset. Each listing was read through its title, its bullets and its specification fields. The items were grouped by use and then compared on the tank lengths, gallon bands, wattages and response times that each one states. No price, rating or sales figure was used, because the record holds none. The picks follow the groups, not a ranking. Each pick names a skip condition drawn from its own listing figures, and each pick carries a limitation taken from the same listing.

What we could not verify

• The 15 inch submersible light lists a maximum compatible wattage of 90 watts, but its light source is 9 watts. The listing does not explain the difference.
• The three SR-619 submersible lights state 5, 9 and 14 watts under one model number, and their bullets are identical.
• The 27 inch submersible light’s specification says floor mount, while its bullets describe suction cups and mounting under the hood.
• The 18 to 24 inch full spectrum light lists a 12600 Kelvin color temperature in its specification. Its bullets do not mention color temperature at all.
• The plant lights’ specifications list both Bluetooth and USB connectivity, while their bullets describe push-button and timer controls only.
• The 18 to 24 inch full spectrum light’s specification says “Batteries included.” Its bullets describe a built-in battery that keeps the timer running during a blackout, which is not the same thing.
• The heaters’ “explosion-proof” wording and the “HH” overheat display are the maker’s claims. No standard is named.
• The magnetic cleaner’s 20 minute response time and its accuracy figure are the maker’s figures, with no measurement method given.
• The 7 to 12 inch clip-on light’s bullets claim a lifespan of up to 30,000 hours. That is a maker’s figure.
• Warranty terms differ across the range: 90 days, one month free return, one year, and lifetime for both the thermometer and the cleaner.
• The sources we opened cover betta temperature, heater setup and electrical safety in general. They do not cover SEAOURA’s heaters, its light modes or its water resistance claims.

FAQ

Which SEAOURA light suits a 20 gallon planted tank?

The 18 to 24 inch full spectrum light with 20 watts is the one whose bullets name a band that reaches 20 gallons, at 10 to 20 gallons. Check that the bracket reaches across the tank, because the listing gives no tank length beyond the title. The 12 to 18 inch light’s band stops at 15 gallons.

Can a SEAOURA heater run in a 10 gallon tank?

Yes, but the 50 watt heater is the one whose band includes 10 gallons, since its listed band runs from 5 to 15 gallons. At 10 gallons that unit gives 50 ÷ 10 = 5 watts per gallon. The 25 watt heater’s band stops at 6 gallons, so it does not cover a 10 gallon tank.

Are the SEAOURA plant lights waterproof?

The specification fields for the two plant lights list them as not water resistant, and their bullets do not describe any water rating. Keep those two lights out of the water. The three submersible lights are listed with an IP68 rating and are meant to be fully submerged, so they are the right choice where the light itself must sit in the water.

Why do the three submersible lights show different wattages?

They share the model number SR-619 and the same bullet text, but their specifications give 5, 9 and 14 watts. The listings do not explain the difference, and the bullets do not settle it. Ask the seller for the wattage in writing before you order, and match the light to the length of your tank.

How fast does the magnetic cleaner’s thermometer show a change?

The specification gives a response time of 20 minutes. The submersible thermometer’s specification gives 2 seconds. That is a difference of about 600 times, so use the submersible unit to check a heater you have just adjusted.

Bottom line

Read the tank length in the title and the wattage in the specification, then choose a heater by its gallon band. Where the SEAOURA figures conflict, treat them as unconfirmed until the box shows the same number.

Sources

• UF/IFAS, Evolution, Culture, and Care for Betta splendens (FA212): https://ask.ifas.ufl.edu/publication/FA212
• UF/IFAS, Ammonia in Aquatic Systems (FA031): https://ask.ifas.ufl.edu/publication/FA031
• UF/IFAS, The Ornamental Fish Trade: An Introduction with Perspectives for Responsible Aquarium Fish Ownership (FA124): https://ask.ifas.ufl.edu/publication/FA124
• UF/IFAS, Aquarium Setup and Maintenance (VM144), archival EDIS PDF copy: https://journals.flvc.org/edis/article/download/109188/104367/152407
• U.S. CPSC, Ways to Protect Yourself and Others From Shock or Electrocution (PDF): https://cpsc.gov/s3fs-public/WaysToProtectYourselfAndOthersFromShockOrElectrocutionuUpdated07312019.pdf