Looking too set up a tank for my angelfish. At the moment he shares the tank with my elephant nose who hasn't taken to him at all he constantly nips him I don't understand why as he gets on great with his other inhabitants. So I think I'm going too have to set up a separate tank I,ve heard 30 gallons is ok? I would like to put other fish in there with him, some cories & my Sailfin molly. Any advice would be great