/www.fishforums.net/index.php?showtopic=119717 said that if the angels were aggressive towards themselves or other fish to turn the temp down to 75F and that would stop aggression do you all think this is true and is there any harmful effects of it?Black skirted tetras are the same thing as black tetras its just an extra word added to itDurbkat, you most likely have black skirted tetras and longfinned-black skirted tetras. They would be fine to put in your 55 gallon with your angelfish.