not entirely,i like mine... apart from the fact he killed a goldfish. but the goldfish had made me mad(picked on a couple fish) so i let it slide.he is pretty agressive though...It's the mean look in the eyes lol. There really is no way to tell, I'm just going on my own experience and the fact that no one ever (I mean never ever) has a good word to say about them. They don't even eat algae after a certain age/size so they are all round a bit rubbish IMO/E