Boy #2 added a Siamese Fighting fish to his collects yesterday but today one of his snakeskin guppies (an adult) is missing - is it possible that the fighting fish has eaten it?
We always had a male Siamese fighting fish (or two females) in our tank. They never attacked any other fish- we were only told not to keep two male fighting fish together.
We've only got one fighting fish in each tank. Girl's fish is a bit mental - it pretends to be ill, or sleeping or dead and then chases after the other red fish. Can't work out where the missing fish from boy #2's tank has gone, but it's not there any more.
The boy is not upset about it, more interested than anything, but if any more go MIA then the fighting fish will have to go back (he has two 'expensive' dwarf chain loaches - £11 each!!).
Siamese fighters all have individual personalities. I have 3 males in a partitioned tank....two of them are very placid and seem frightened of their own reflection whilst the other one is an utter thug and even attacks the filter.
It's perfectly possible for an aggressive male to attack and kill a guppy....ive seen it happen in one of my tanks.