I just started using biotrop for my 6 foot (540L of water) planted aro tank. Had been using enough for 400L of water but it did not stop my NO3 from shooting way way beyond my 40ppm test kit limit. Just added enough to handle 800L of water. Waiting to see results.
I may actually be nullifying the effect as the filter is connected to an external CO2 reactor and any Nitrogen gas produced may actually be mixed back into the water again. Shooting myself in the foot. I think I better dig out my spare 2231 and use it as a biotrop canister.
A pack enough for 400L is about $70++ to $80++ dollars. The pack for 100L is about $30. Suppose to last about 5 months. I think that's not too bad. I just chuck the stuff in a filter bag and put it in the filter... no need for the Biotrop hardware.
Biotrop dose not really control algae. It helps reduce NO3 and thus reduces the chances of getting algae. You might want to consider Dennerle's Gold7 which claims to prevent algae.
Do consider carefully about using biotrop... a planted tank should never be completely without NO3. I'm only using it due to the extremely high amounts of NO3 coming from the arowana's diet.
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