06-10-2008, 05:54 PM
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I think the silver dollar will be fine at least for a while. Pacu will munch a fish that fits in their mouth, but they are by no means predators. Silver dollars themselves can get 8", so if you make sure it is well fed and growing all will hopefully work out.
Unfortunately, it's probably best to rehome your Pacu unless you intend a major tank upgrade. Pacu are nervous fish that are meant to be kept in groups, so it's not really fair to keep him on his own. Also, beware, they are tank busters. They are known to get scared, burst across the tank and crack the glass. You'll definitely want an acrylic tank for him.