I know I might get flammed for saying this but i would argrue that you can get away with ahve a pair of true or false perculas in a 10g tank. Because they are a pair there would be no aggression towards them and it would also mean they really only need on place to call home. I watch my pair of clowns in the 75 gallon and they stay in the around the same mushroom rock unless they are going after food. One of the hobbiest that got me started by giving me free corals and additives has a pair of clowns in 10g tank who seem to be thriving. So in short i would argure you can keep a pair of false or true perculas in a 10g but only them for the others get two big.
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CollegeReefer
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