I have a 10 gal heavily planted freshwater tank. I have 3 neon tetras a Killifish and a pygmy cory. My killifish has started chasing and attempting to breed with my tetras even though it is supposed to be a non aggressive species of killi. im worried this may stess out my neons & maybe even kill them. Is there any other one fish I could replace him with? preferably staying around 2 inches in length and somewhat pretty. I can upload pics of the killifish if needed.