ihave 2 angel fish that i got about 6 months ago they nip here and there but now its getting way out of hand, i came home today with them both tore up real bad no fin on either one is fully intact. i put a divider in the tank for now and even with that up theyjust sit there and nip at the divider trying to get at the other one. theyalways followed eachother around and got along great but now they are after blood. what could cause them to get so mad at each other. alli have in my 30gal tank is the 2 angels, 1 balloon molly, and a sucker fish. could the water cause this stress ihavent done any test to see what im at buti know im already behind a few days for a water change. so what should i do.