I wouldn't have thought so. However, we do keep our fish in an environment that is completely different to a natural environment. Some fish will be kept with fish that they would never come across in the wild so strange things could possibly happen. Fish may hang around with other fish and get along just fine. But I think that if you were to put the same sort of fish in the tank, they will probably hang around with each other, that's what normally happens anyway. Sorry, I haven't been much help, it is one of his questions that that you just cannot give a conclusive answer to. I think you would probably have to do experiments for quite a long time to find out if this kind of thing does happen.
You've often head of Tigers caring for piglets, the any reason this is happening is because the pig lets have got the tiger cubs skins wrapped around them, if they didn't, they will be a very tasty meal in a few seconds, I bet
BTW can you make your photographs no bigger than 500 pixels wide in future, this picture is absolutely huge and he just cannot view it properly without having to scroll. THX:)
