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Hi, I just purchased a new tank--a 40 gallon hex for our Oscar. Can anyone recommend a good filter for this type of set-up? Also, what is a bio-wheel? Thank you very much
 

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Hmm, that tank is a bit small for an oscar, they are big waste producers so you will need the best of the best filter. I would suggest a wet/dry sump (if you dont know what it is ask someone cause i cant be bothered explaining). Or you could use a canister filter. A Bio-wheel is a compact wet dry bio medium where beneficial bacteria should live in. You could get a bio wheel filter but not by itself.
 

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well you might be able to run like 2 biowheel 350s or 400s just do alot of water changes. and a biowheel is a filter that has a little wheel at the mouth which encourages beneficial bacteria to grow on it, without that bacteria fish cant survive thats why we cycle tanks.
 
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