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Crystal
For about six months, the zoanthids have not been growing, rarely opening, and not all of them, and even a few of the montiporas are slowly fading and dying over the course of several months. They gradually lighten and then die. Even the Xenia is not growing! The sarcophytons, euphyllia, caulastrea, and anemones are behaving normally, and the fish are fine as well. The aquarium is 400 liters, with just under half of it filled with rocks, salinity at 1.23, temperature at 25, using Tetra salt, and I change 50 liters of water every two weeks.