Every time I buy 4-5 fish within 5 days all of the fish will be dead. Occasionally one will live but that has been rare. When I buy corals they all live and thrive in the tank but for the life of me I can't keep fish. I only shop at Coral Reef PC so every thing I have has come from one source. The tank in question is a 100gallons and has been set up for about 4.5 months now. I feed once a day with the principle that there should be little to no food floating around after 5 mins. All tests check out fine, temp is at 78 with a fluctuation up to 80 when the mh are running and the house gets hot. What has survived is about 30 snails, one fox face, one rabbit fish, one diamond goby, one 6 line wrasse, one sally light foot, one coral bandied shrimp and two cleaner shrimp. Please help me!!!(scratch)