OK this is my first tank just got it 3 days ago My main tank is not ready for fish yet because the delivery guys brought the wrong light fixture so I do have a 20 gallon quarintine tank and I bought some fish for that 2 blue chromis ,2 3stripe damselfish and 2 3 spot dominos and 2 orangetail blue damsels I put these in the quarintine tank because thets what i was told to do by my lfs and i put a shot glass of live sand in the tank everyone looks fine except my one green chromis he is breathing fast laying on bottom and turning unpside down I dont know what is wrong with him but i think he is dying what should i do with him I am going to pick up the light at 7 tonight from the lfs please help I dont want my other fish to die I have him in a fish net at the top of the tank because the other fish are bitting him the quarintine tank is made u of aeclipse top with the total filtration BIO-Wheel Efficiency it that good enough thanks for your help sorry I am a newbie