OK, another question as things progress . . . hubby loves this fish, she's got quite the personality - but you're right, she is vicious. The 20 gal she was in got full of algae in pretty short order, so we moved the two (very large) pleckos in to clean it up. At first she was fine - but then she started attacking and trying to bite both of them. I'm not willing to sacrifice two perfectly healthy fish to bites - so we had no choice but to move her back into the 10 gal that the original owner had her in . . . at least until the clean-up is accomplished. I'm starting to regret taking on someone else's problem - I love my community tanks and I refuse to give up even the 30 gallon to one aggresive fish. I hate to say it, but she's not that wonderful. Not that hubby is ready to give her up - but what do we do? Can they live in something like an outdoor pond? Although, again, who wants a whole outdoor pond with only one fish? And what about that algae problem - the pleckos do a good job, but they're obviously not a solution. Sigh. Any suggestions - this seems discouraging because there's no way we're ever having a 125 gal tank in our house and I feel like I tried to do someone a favour and now it ends up I really can't give their fish a good home!
Not only that, but now we seem to have figured out the water-killing-the-fish problem, and we want to re-stock our tanks with beautiful little fish like swords, angels, guppies, platys, tetras and the like. Even less incentive to keep a large, vicious fish in our "feature" tank!