btw i keep a group of 5 yoyo with modest size tetra and angelfishes - while both clown and yoyo will harass a fish that is weak or near death; generally speaking they leave the angels and serpae alone - this is a big community aquarium (600 gallons) with 13 clowns; 3 angels and some other stuff - the biggest problem for the angels is the yoyo love their eggs and quite frankly they have no clue what to do when the yoyo eat them - they can't figure out how to attack them .... so they just watch and probably swear a lot.