Thanks for the info lads

I hate to see natural inviroments destroyed or species endangered but we need new blood to stop inbreeding. A lot of fish on sale at the moment are from brother/sister parents and people buy these and breed from them again.
Just look at how weak the Guppy has become.

Just for the record he wasn't joking, he didn't seem like the brightest penny. but I was wondering after if they might have been pacus's most people don't seem to know the difference even though the teeth should give it away. That wouldn't be quiet so bad., not right either, but might explain why the koi haven't died of stress....
Did I tell you about the guy that put a twelve inch oscar into a 24 inch tank, with two turtles and two pacus and various other things. It battered it self to death and he seemed surprised when I said the tank might have been too small. I feel like I need the fish shrink when I leave work some days!!!

but I was wondering after if they might have been pacus's most people don't seem to know the difference even though the teeth should give it away.

Very true. Anyone that knows about P's would be able to tell but to anyone that's not well read about them, it would look similar enough.