The best filters for a planted tank in 2026
A planted tank wants good, even circulation without a washing-machine current, plenty of biological media, and flow you can direct through the scape — which is why aquascapers reach for canisters. These are the filters we'd put on a planted tank.
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Frequently asked questions
What filter flow is best for a planted tank?
Aim for roughly 4–5× turnover, but focus on spreading it evenly with a spray bar so every plant gets gentle circulation and CO2-rich water — without blasting delicate stems. Canisters make this easy because you can direct the return exactly where you want it.
Does a planted tank filter affect CO2?
Yes, indirectly. Good, even flow distributes injected CO2 and nutrients to every plant, which is why aquascapers favour canisters with a spray bar. Just avoid so much surface agitation that you gas off your CO2 — it's a balance.
Is the Oase BioMaster good for planted tanks?
It's a favourite: big biological capacity, a pre-filter that keeps maintenance intervals long, and (on the Thermo version) a built-in heater so there's no heater cluttering your scape. The Fluval 407 is another strong, quieter-running choice.
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