We have a 30 Gallon Tank, with 2.5 inch sand bed and many stacked rocks. 4 Turbo snails, 3 sand snails, 1 yellow watchman goby, 1 clown fish, 1 cardinal, 1 bullet goby, 1 skunk shrimp, 1 porcelain crab, and 1 emerald crab. Everyone’s been doing very well, very happy, no water problems at all I...