I am new too the reef tank have had plenty of fish only tanks before. I had bought a rock with about 4 green mushrooms on it and another unknown mushroom. The Mushrooms did fine for a week or so staying open, I went on vacation for 5 days when I came back 2 of the mushrooms have decentegrated and the others have shrunk to just about nothing. I have noticed however that there are new little sand sized green dots forming on the rock. Are these green dots juveniles? My xenia is doing fine and growing. My nitrites are zero nitrates are a little high need to do water change, and my ph was a little low 7.8, which I corrected and brought up to 8.3 today. Could my nitrate and ph level cause the mushrooms to decentegrate and shrink to nothing was curious as the xenia is doing great.