Mine are that high as well, around 80 ppm. I think it is due to my crushed coral. I have a 40 gallon with 55# live rock, remora skimmer, fluval 204 filter, a dragon goby, 2 chromis, brittle star, fire shrimp, and some snails and hermits. If i change my crushed coral to sand, do i have to take my fishes and such out and wait for the sand to settle or can i put them back in right when i add the sand because i know it will be cloudy for a few days.