I just bought some zoos and they seem to not be opening. I have a 55 gallon tank 48x12x20 and placed them halfway up running a 2bulb T5 (12000k and blue actinic). My nitrates-20, phosphates-0.25, calcium-360, carbonate hardness-9. I just set up a refugium where prior I was running a fluval. My refugium consists of rubble rock and chatoe macroalgae, I do use tap water for water changes and top offs. My temperature of tank is set at 80-82degrees. I have 3 chromis, yellow tang, mandrin goby, 2 blood shrimp, 2 cardinals, 2 perc clowns, hermit crabs and turbo snails. Plenty of coraline algae growing. By the way, this is my father in-laws tank but he does not want to listen to me so I wanted to show him this thread. Give him some advise on why his plate coral is dead (second by the way), frog spawn died and zoos are not opening.