i'm not worried about my betta trying to nip the endlers fins but that the endlers might try to nip my bettas fin. i had my betta in a comunity tank with longfin danio and other fish and he was never bothered by them, but unfortunately i found him with part of his tail missing, so he moved out... how many male endlers should i have? and if i decide to go for Corydoras pygmaeus, would 4 be an ok number? (aqua one 320 tank, 32 liters) thanks