Alright I have a 55 gallon tank with 2 discus, 2 angels, 1 rainbow shark, 1 small snail, 1 small regular pleco, and now 4 glofish(zebra danios), 5 glofish(tetras), and 6 glass fish. the glofish are dying one by one and they seem more aggressive then they should be towards each other ONLY. I had...