Using RO water, ammo 0, nitrite 0, nitrate 20ppm, ph 8.2 , temp 76, 3 small damsels, 2 small clowns, 1 banded shrimp, 5 hermit crabs, feed 1/2 a cube of brine shrimp in the evening once a day, do 25% water change either once a week to week and 1/2. Equipment is in signature and protein skimmer...