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I had 3 in my 45gallon community. Two of the 3, a male and a female, we're very aggressive. They did a fabulous job of keeping the tank clean. But I ended up removing them because of the aggressiveness.
I've been interested in them too. The bad experiences are kind of disappointing...but I've never seen them for sale anywhere anyway, so it's no big deal I guess!
Before I got mine, everything I read said they were peaceful community fish. NOT! They might not chase a pleco or some other fish that would ignore them. Oddly, they never went after my Betta. But my poor swordtails... oh my.