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    Red-bellied piranha bitten by others! What now?

    Hi everyone, I am new in this forum, but I really need your help. I have 6 red-bellied piranhas in a 720-liter freshwater tank. Four of them I got "second-hand" when they were already a few years old, they are now about 25 cm long. I added two smaller piranhas less than a year ago, those are now...
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    Bichir "backspines" bitten off, will grow back?

    A few of them got bitten off halfway, does anyone have experience with them growing back?