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I Have No Fish but I Have Japanese Girls On My Ava
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My 55 gal is 48x18x20, and if im correct, 36x18x18 would be a 40 gal tank. Depending on the size, I say 4-5 around an inch and 2-3 over 4" for now.
 

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the tank is 50 1/2 US gallons
if you put 10 RBP's in there then that would be about 5 gallons per fish. Some people reccomend that you have around 20G for one of these fish. There are also people who believe that you do not require that much room.
the decision is yours but Personally myself I would chop that 10 in half.
 
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