My temp is between 78 and 80 depending on when the lights are on, and my trates at the last check were between 0 and 5 ppm, and were talking about ten snails. i turned them over last night before went to bed and they still aren't looking good. too much of there body exposed. and none of the crabs got any of them last night. really confused, not sure what went wrong. everyone else is doing just fine