I have been offered two angel fish by my grandads friend , they are not fully grown but are terrorising the other fish and have killed four of them. They are currently kept in a small tank could this be the reason why they are being so nasty. If i took them off him would they be ok in a 125l tank. Would they be able to be kept with 2 female mollies and a female swordtail and a tiger plec or not i currently have 8 male guppies in there but i can put them in another tank. Sorry about all the questions but i need some advice before i get them.