NinjaSmurf
Devils Advocate
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- May 24, 2004
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Piranhas will eat each other if they don't have anything else to eat for a long time, but I highly doubt you will starve your fish, so this shouldn't be a problem, and you can always keep just one if you want. And an oscar in a 55 if fine as long as you have good filtration and nothing else in the tank, because they'll eat or kill anything small, and anything that could live with one without getting the stuffing knocked out of it would be too big to go in the 55 with it anyways. Happy fish hunting...