My advice.....don't buy pacu as it is not fair for the pacu when it get too big for your 55gal and there are no places to take him in.
Don't buy a fish if you don't have the right tank size in the first place.
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i am sorry .. but it is extremely hard to get rid of a pacu.. not many people can accomodate one ..so you would be emotionally trapped... and even harder that you be watching your pacu suffer in such a small tank.. pacus for the most part are doomed.. whether we buy them or don't buy them.. very few can keep pacu a lifetime.. and they are tank busters.. so unless you can provide i would not purchase.. it is heartbreak eventually.
+1000 don't do it man
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