i bought guppys in december, 7 of them, they attacked my other fish, i got a spare tank from my dads house, filled it up with luke walm water chased them round the tank with my tiny net, when i caught them chucked them into this newly setup tank, about 10 mins old and they all survived, a bit later i found a beautiiful little south american puffer, i bought him but had heard that they can be nippy so i put them in with the guppys, the guppies were attacking th puffer, no the other way around, i hate guppys i will never buy them again!!!!!! oh, i ended up taking them back to lfs