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how much filtration for nano fish?

767 Views 10 Replies 8 Participants Last post by  Assassynation
planning on setting up a 20g long with scarlet badis and some nano schooling fish
im wondering if a internal filter would work instead of a sponge
something like this






or should I be aiming for less filtration since the fish are so small?
maybe a whisper 10?
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I have that exact filter in my 10 gallon QT tank, its garbage. It takes up a lot of room and the flow is really slow. I think you'll have a lot of dead spots in a 20 gallon long. I have a 20 gallon long and I use a marineland penguin 200. They run about 30 bucks at your lfs.
 
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