Fish to Avoid in a Planted Aquarium Setup Guide
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The fish to avoid in planted aquarium tanks fall into three groups: fish that eat plants (silver dollars, goldfish, Buenos Aires tetras), fish that dig or uproot (large cichlids, mbuna, eartheaters), and fish that bulldoze or simply grow too big (common plecos, clown loaches, giant catfish). Pick tank mates from outside those groups and a planted tank has a fair chance of staying planted. Below is the list with the reason for each, followed by the lights, substrate and fertilizer listings that suit a planted setup.
Quick answer
- Skip silver dollars and goldfish if you want soft or leafy plants to survive; both are described as constant grazers.
- Skip big diggers such as oscars, Jack Dempseys, convict cichlids, mbuna and eartheaters; they move substrate and uproot plants.
- Be careful with common plecos and clown loaches; they are sold small and grow large.
- Small schooling fish such as neon tetras, rasboras and ember tetras are the plant-safe default, per the hobby guide linked at the end.
Why some fish and planted tanks do not mix
A planted tank is a small landscape. Roots need undisturbed substrate, leaves need to stay attached, and the water needs to stay clear enough for light to reach the plants. Fish cause trouble in three ways. Some eat the plants. Some dig or shove things around. And some make so much waste that algae covers the leaves. A single fish rarely does all three, but a bad match usually does at least one. Our guides on signs of sick freshwater aquarium fish and how to acclimate new aquarium fish help once you have picked the right species.
Fish that eat plants
Silver dollars
Silver dollars (Metynnis species) are one of the classic plant eaters. The hobby guide we reviewed says their sharp teeth crop plants quickly, including tough leaves, and lists cabomba, anubias, Amazon swords and java fern as at risk. It says to keep them only with silk plants or fast-growing floating plants that can outpace their grazing.
Goldfish
Goldfish graze constantly and uproot soft carpeting plants and fine stem plants, according to the same guide. Their heavy waste load also makes them a poor match for a planted setup. The guide says thick plants such as Anubias gigantea tied to driftwood may survive. If you are thinking about betta and goldfish together, see our page on betta fish living with goldfish.
Buenos Aires tetras
Unlike neon tetras or rummynose tetras, Buenos Aires tetras go after soft stem plants such as ludwigia, rotala and myriophyllum, according to the guide.
Pacus and iridescent sharks
The guide lists these in its summary of problem species but gives them no dedicated section, so treat the entry as a flag, not a full profile.
Fish that dig and uproot
Oscars, Jack Dempseys and convict cichlids
These move large amounts of substrate during territorial and breeding behavior. The guide says oscars will pull plants out of the gravel if they block their sightlines or resting spots.
Mbuna and other Lake Malawi and Tanganyika cichlids
They dig pits under rocks and also graze plants. The guide adds that their hard, alkaline water needs (pH 7.8 to 8.6) suit few aquatic plants.
Geophagus
Eartheaters sift sand continuously. The guide says this destabilizes carpets such as dwarf hairgrass and Monte Carlo.
Fish that bulldoze or outgrow the tank
- Common plecos: sold small, they can reach 15 to 24 inches, and adults rasp broad leaves and uproot plants while swimming.
- Clown loaches: adults reach about 12 inches, punch holes in leaves and dart through the substrate, disturbing carpets.
- Redtail catfish and tiger shovelnose: they outgrow nearly every home aquarium, which makes rooted plants impossible to keep.
Safer choices for a planted tank
The same guide recommends schooling characins and small carps such as neon, cardinal, harlequin rasbora, rummynose and ember tetras as plant-safe fish that add color with little waste. For cleanup, it names bristlenose plecos (4 to 5 inches), otocinclus, amano shrimp and nerite snails as grazers that do not tear plant tissue. For a centerpiece fish it lists German blue rams, apistogramma, pearl gouramis and angelfish. For plants themselves, it says anubias nana, java fern and bucephalandra have thick leaves that resist nibbling and can be attached to hardscape above the substrate, while cabomba, mayaca and fine mosses are highly vulnerable.
One note on bettas: the guides we checked in this research do not discuss betta in a planted tank directly, so the pack and guide cannot say whether a given betta will leave a given plant alone. If you keep a betta, choose the tank for the betta first.
How to vet a fish before you buy it
A short checklist keeps you from repeating the mistakes above. First, look up the adult size, not the size in the store tank; the plecos and clown loaches in the guide are the standard warning. Second, ask what the fish eats. Fish described as herbivores or omnivores, such as silver dollars and Buenos Aires tetras, are the ones the guide flags for eating plants. Third, ask how it behaves around substrate. Digging, sifting and pit-building are the behaviors behind the cichlid and eartheater entries. Fourth, ask how much waste the fish makes. The guide says heavy waste from goldfish, oscars and adult plecos can coat leaves and encourage black beard and hair algae, and it tells you to make sure your filtration can handle the load and to understand the nitrogen cycle before adding messy feeders. If an answer is unclear, pick a different fish, because the plants take weeks to grow back and the fish will not wait.
Planting around the fish you already have
If a problem fish is already in your tank, the guide’s advice is practical. Choose sturdy plants for mixed tanks, attach them to hardscape above the substrate so a digger cannot uproot them, and keep delicate species such as cabomba, mayaca and fine mosses away from grazers and substrate disturbers. With silver dollars it suggests silk plants or fast-growing floating plants. None of this makes a bad match a good one, but it can slow the damage while you plan a move.
Reading the product listings below
The lights below state their length range, wattage, lumens and timer options. The substrate lists grain size and weight. The fertilizer lists dose spacing. Use those numbers to match the product to your tank, and treat everything else in a listing as the maker’s description.
Quick reference table
| Fish | Problem named | Plants most at risk |
|---|---|---|
| Silver dollar | Eats plants | Cabomba, anubias, swords, java fern |
| Goldfish | Grazes and uproots, heavy waste | Soft carpets, fine stems |
| Buenos Aires tetra | Eats soft stems | Ludwigia, rotala, myriophyllum |
| Oscar, Jack Dempsey, convict cichlid | Moves substrate, uproots | Anything rooted |
| Mbuna and similar cichlids | Digs, grazes, hard-water needs | Most aquatic plants |
| Geophagus | Sifts sand | Carpets |
| Common pleco | Grows large, rasps leaves | Broad leaves |
| Clown loach | Punches leaves, disturbs substrate | Stems and carpets |
Gear that suits a planted tank
None of the listings below is a fish, and none of them states which fish it suits. They are the plant-side items from our product data, each described only by what its own listing says.
hygger 18W 24/7 Lighting LED Light
This light has a default sunrise, daylight and moonlight cycle, with orange light from 6 am, white from about 8 am to 10 pm and blue until about 10:50 pm. A DIY mode lets you set a 6, 10 or 12 hour timer, five brightness levels and seven colors. The listing states 18W, 98 LEDs, CRI 85, about 1,075 lumens, an adjustable bracket for tanks 18 to 24 inches long and a 2 year warranty. The listing’s recommended uses include plant growth.
hygger Clip-On 24/7 Lighting LED Light
The smaller sibling uses a clip for tank walls under 0.9 inches thick, can be mounted horizontally or vertically, and lists 14W, 68 LEDs, 817 lumens and an application range of 12 to 20 inches. It has the same sunrise-daylight-moonlight cycle and a 2 year warranty. Choose it if a bracket is awkward on your tank.
WEAVERBIRD 6W Planted Clip Lamp
The smallest light in the group lists 6W, 12 LEDs, 600 lumens, 8000 Kelvin and fits tanks 8 to 15 inches wide with glass up to 6 mm thick. It is a plastic clip lamp with a US plug at 110V and weighs about 4 ounces. The listing says it helps plants thrive. Use it on a nano tank only after confirming the glass thickness.
Lominie 16W Full Spectrum Aquarium Light
This clip light lists 16W, 16 LEDs, 6933K, four built-in lighting modes with a natural 24/7 light cycle, a remote, a 360 degree gooseneck, and a clamp wide enough for 25 mm glass. Its smart control and Wi-Fi controller are sold separately, per the listing. Warranty is listed as 1 year from the manufacturer.
30W Planted Tank Light with Timer
The N30 lists 30W, two independent channels with 10 level dimming, three modes, five timer settings (6, 9, 12, 15 and 24 hours), a 360 degree gooseneck arm and a built-in silent cooling fan. It has a one year warranty and a swivel mount. It is the strongest light in this group on paper, so it fits a deeper tank better than a nano.
Ultum Nature Systems Controsand Santa Fe Gravel
This substrate is an 8 liter bag of fine Mojave sand, 25 pounds, with a grain size of 0.4 to 0.9 mm. The listing says it is designed for planted aquariums, suits bottom-dwelling species and live shrimp that like to sift, and recommends rinsing before use to keep water clear. It also says it works in blackwater tanks and tanks with dragon stone or driftwood.
Root Tabs Aquarium Plant Fertilizer, 100 Tabs
The listing gives an NPK ratio of 1 to 0.5 to 2.8, 1.0 g tabs that release over 2 to 3 months, and an instruction to place one tab every 5 to 6 inches and push it about an inch into the substrate. For first use, the listing says to start at 80 percent of the recommended dose and use less if unsure. It states a little white suspension in the water is normal. The listing says the product is safe for fish and shrimp; follow its dosing and watch your plants.
Mistakes to avoid
- Buying a baby fish without checking adult size. Common plecos are the standard example.
- Adding a grazer and hoping. Silver dollars and goldfish are the names the hobby guide gives for fast plant damage.
- Using fine sand with sifters. The eartheater entry shows how a good fish can still flatten a carpet.
- Overdosing fertilizer. The root tab listing itself says to use less if unsure.
- Mismatching light and tank. Read the length range on each light listing.
FAQ
Can goldfish live in a planted tank?
The guide advises against it for soft plants; goldfish graze constantly and produce a lot of waste. Thick plants tied to driftwood may survive.
Are cichlids always a problem?
The guide names oscars, Jack Dempseys, convict cichlids and mbuna as problem species for digging or grazing. It names German blue rams and apistogramma as centerpiece options that do not dig heavily.
Which fish are the safest bet?
Small schooling fish such as neon, cardinal, harlequin rasbora, rummynose and ember tetras, per the guide.
Which plants survive nibbling?
The guide lists anubias nana, java fern and bucephalandra, attached above the substrate.
Do I need root tabs?
That depends on your plants and substrate, and the listings do not say. The root tab listing describes its use for nano, medium and large planted tanks.
Bottom line
Choose fish from the plant-safe group, leave out the grazers, diggers and bulldozers, and size your light and fertilizer to the tank. When a species name is unfamiliar, check its adult size and habits before you buy.
