ok so i have a 55g with a 75 g filter zero ammonia the salt level is fine the tank was cycling for about 3 month before i put 1 clown 3 blue tail damsel 1 fire fish goby and 2 snails there where all under 1 inch so it was not a huge bio load on the system everything just started to die off they where fine for about a month so once they all died i waited 2 weeks and bought 1 tomato clown and 1 bubble tip anemone and 3 days later the cown died again but the bubble tip anemone is doing great ? whats going on here