Complete Planted Aquarium Setup Guide for Beginners
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This planted aquarium setup guide takes you from an empty tank to a growing, cycled planted aquarium in a clear order: pick the tank, lay the substrate, arrange the hardscape, plant, fill, set up the equipment and light, then cycle before adding fish. The steps below follow two beginner guides, one from Canton Aquatics and one from Aquarium Co-Op, and they favour a low-tech approach: no CO2, hardy plants and a simple light on a timer.
Quick answer
- Start low-tech: easy plants, an LED light on a timer, no CO2.
- Use 2 to 3 inches of substrate, plant before you fill, and cycle the tank before fish.
- Begin with about 6 hours of light a day and raise it slowly.
- Change one thing at a time and keep the routine steady.
Step 1: Choose a tank size
Canton Aquatics gives a simple size guide. A 5 gallon tank suits a desktop nano, betta or shrimp setup. A 10 gallon is described as a good beginner size, and a 20 gallon long is recommended as a first aquascape because of its proportions. Tanks of 29 to 40 gallons suit community or intermediate scapes, while 55 to 75 gallon tanks are called advanced, partly because depth makes light penetration harder. The guide also notes that longer, shallower tanks are easier to light and to aquascape.
If you are planning for a betta, read our guide to what size aquarium for betta fish before you buy, and see the betta fish tank buying guide for sizes and setups that work.
Where to put it
Set the empty tank on a level surface that can hold the weight. The Canton guide uses about 10 pounds per gallon as a rule of thumb and says never to move a full tank.
Step 2: Pick a substrate
Substrate choice splits beginners into two camps, and both guides agree on the depth: at least 2 to 3 inches.
Inert substrate plus root tabs
Aquarium Co-Op advises beginners to use an inert, nutrient-free substrate such as aquarium gravel or coarse sand, and to avoid dirt and enriched soils because their nutrients can leak into the water and fuel algae. If you keep root-feeding plants such as cryptocoryne or sword plants, add root tab fertilizers under the substrate. Canton lists pool filter sand, blasting sand and gravel of 1 to 3 mm as inert options and says to replace root tabs every 4 to 6 weeks.
Active substrate
Canton also names nutrient-rich active substrates such as ADA Amazonia, Fluval Stratum and UNS Controsoil. These are not rinsed, and they cloud the water at first. Only use an active substrate if you are comfortable managing the early nutrient release.
Slope it
Canton suggests sloping the substrate from 3 to 4 inches at the back to 1.5 to 2 inches at the front. This adds depth to the layout and gives tall plants room for roots at the back.
Rinse inert substrate, hardscape and the tank with plain water and no soap to reduce cloudiness. Do not rinse active substrates.
Step 3: Arrange the hardscape
Rocks and driftwood form the framework of the tank. Aquarium Co-Op says to arrange them before adding water and to plan where each plant will go. Canton adds a few details:
- Soak driftwood for 1 to 2 weeks so it waterlogs and leaches tannins.
- Dragon stone, seiryu stone, lava rock and slate are listed as plant-safe rocks.
- Avoid limestone in soft water, since it raises pH and hardness.
- Place the main stone off-center.
- Attach Anubias, Java fern and Java moss to driftwood or rock rather than burying them.
Step 4: Choose easy plants
Aquarium Co-Op recommends beginner-friendly species because they are hardier, a wide variety so that some suit your water, and a large quantity up front because dense plant mass uses up nutrients and reduces algae. Canton’s example list for a low-tech 20 gallon is:
| Zone | Plants named |
|---|---|
| Foreground | Dwarf sagittaria, Anubias Nana Petite |
| Midground | Cryptocoryne, Anubias Nana |
| Background | Vallisneria, hornwort, anacharis |
| On hardscape | Java fern, Java moss |
| Floating | Amazon frogbit, red root floater |
Put taller plants at the back and shorter plants in front. Place high-light plants under the light and low-light plants in shadowed areas or at the edges. Do not move plants once planted, since each move needs a readjustment period. If you keep a betta, see our page on the best aquarium background for a planted tank for ideas on finishing the back of the tank.
Step 5: Plant, then fill
- Add the substrate with the slope above.
- Arrange the hardscape.
- Push root tabs 1 to 2 inches deep, 4 to 6 inches apart, in planted areas.
- Plant the background first, then the midground, then the foreground. Attach epiphytes last, using tweezers.
- Pour water slowly onto a plate or bag so the substrate and plants are not disturbed. Canton fills to about 80 percent first; Aquarium Co-Op adds about 6 inches of water first so the leaves are supported while you plant.
- Dechlorinate all water.
Step 6: Filter, heater and flow
Canton says hang-on-back filters suit tanks up to 55 gallons, canisters suit larger tanks, and sponge filters suit breeding and shrimp tanks. Aim the outflow so water moves in a circular pattern, because dead spots can become algae hotspots. Set the heater to 76 to 78 degrees F for tropical fish, per the same guide. Aquarium Co-Op says to position the heater and filter during layout so decorations can hide them, and to leave them off until the tank is filled; if you use a heater, let it sit for about 30 minutes to adjust to the water temperature before switching it on.
Both guides leave out heater wattage, so check the size on the heater box for your tank volume, or read our look at the Aqueon vs Tetra aquariums to see what parts come with a kit.
Step 7: Set up the light
Any LED made for the tank size works for a low-tech setup, per Canton. Use an outlet timer so the light runs the same hours every day. For a new tank, start at 6 hours. Canton’s schedule for the first month is 6 hours in week 1, then 7 hours from week 3. Aquarium Co-Op suggests 5 to 6 hours a day at the start and then increasing gradually each week as growth appears. For a longer look at choosing a fixture, read how to pick the best planted aquarium light.
Low-tech tanks usually settle at 7 to 8 hours; with CO2, 8 to 10 hours. If algae appears, shorten the day first.
Step 8: Cycle the tank
Canton recommends fishless cycling. Add an ammonia source such as fish food or liquid ammonia to feed the bacteria, and test every few days. The cycle is complete when ammonia and nitrite read zero and nitrate is present. Typical cycling takes 2 to 6 weeks, and heavily planted tanks may take 1 to 2 weeks because plants absorb ammonia. Established filter media or a bacteria starter speeds things up. Our guide to an aquarium ammonia test kit shows what to compare when you buy one.
Aquarium Co-Op does not discuss cycling, and neither guide gives a target cycling temperature, so follow your filter and test-kit instructions.
The first month at a glance
| Week | What the Canton guide suggests |
|---|---|
| 1 | Lights at 6 hours a day. Cloudy water is normal. No fish. |
| 2 | Test the water. Some plant melt is expected. Keep cycling. |
| 3 | Raise lights to 7 hours. Do the first 30 percent water change. New growth should appear. |
| 4 | If ammonia and nitrite are zero, add a few fish and start weekly water changes. |
Aquarium Co-Op adds that melted leaves are not a reason to throw plants out, since smaller new leaves usually replace them, and that if plants still struggle three to four weeks after planting you should check for nutrient deficiencies.
Ongoing care
- Water change of 25 to 30 percent weekly, followed by fertilizer.
- Clean the glass weekly.
- Trim plants every 1 to 4 weeks as needed.
- Replace root tabs every 4 to 6 weeks.
- Rinse the filter monthly in tank water, not tap water.
- Vacuum the substrate lightly between plants once a month.
Aquarium Co-Op suggests a low dose of an all-in-one fertilizer at the start, raised weekly as growth appears, with test strips to guide the dose. It also names a siphon for water changes, an algae scrubber for glass and scissors for trimming.
Mistakes to avoid
- Too much light with too little CO2, which triggers algae.
- Too few plants, which leaves room for algae.
- Adding fish before the cycle finishes.
- Over-cleaning and sterilizing, which removes beneficial bacteria.
- Burying Anubias and Java fern rhizomes.
- Starting with difficult plants.
- Changing several variables at once.
FAQ
Do I need CO2 for a planted aquarium?
Not for a beginner tank. Canton recommends starting low-tech, with no CO2, easy plants and 6 to 8 hours of standard light, then upgrading later if you want to.
How much substrate do I need?
Both guides give at least 2 to 3 inches. Canton slopes it from 3 to 4 inches at the back to 1.5 to 2 inches at the front.
Should I plant before or after adding water?
Plant with the tank partly filled. Aquarium Co-Op adds about 6 inches of water first, and Canton plants before filling to about 80 percent.
How long until I can add fish?
When ammonia and nitrite read zero and nitrate is present. Canton says 2 to 6 weeks is typical, and 1 to 2 weeks in a heavily planted tank. Do not go by the calendar alone; go by test results.
How long should the light stay on?
Start with 5 to 6 hours and raise it gradually. Low-tech tanks usually land at 7 to 8 hours.
What if a fish looks sick?
Ask a vet who treats fish. This guide covers setup, not treatment.
Bottom line
Keep it simple: a modest tank, 2 to 3 inches of substrate, hardy plants in large numbers, a timed light starting at about 6 hours, and a full cycle before fish. Everything else can be improved later once the tank is stable.
