Check that nitrite and pH again, okay?
We do 25% water changes 1/wk. Residents include: Sail fin Tang, Mandarin, Xmas wrasse, 6 Line wrasse, Ferry wrasse, Yellow Coris wrasse, 8 clown gobies about inch each, percula clown, yellow spotted watchman goby. All fish are less than 2 inches. Clean up crew consists of about 150 hermit crabs, 1 emerald crab and 20 turbo snails. I feed the tank two cubes of frozen mysis/day and Spectra Vital 1/wk. The tank has been thriving up until about a week ago. I mean it really looked incredible. Now, my frogs spawn and hammer corals wont open at all. Theyre sliming or disintegrating. Ive already completely lost two frog spawn heads. Mushrooms looked shriveled, polyps wont open up either. Brain corals, trumpets, and plate corals seem to be fine. I also noticed a bit of red slime algae on the sand.
