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what size tank

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I dont understand you poll?
... but if your asking what size tank you need for the one RBP then somewheres around 20G will do the trick, they prefer shoals though
 

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It may be 20 gallons per rb but I don't think that really applies to a single piranha. I've seen a few single piranha's in a 20 gallon and they look miserable. I say give em at least 3 feet to work with from side to side and about 18 inches front to back and a single piranha should be happy.
 
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