One of the easiest corals I have in the tank is my duncan. It’s always open and fully extended, indicating that it’s been happy for the 3+months that it’s been in my tank. However, there now seems to be trouble in paradise. It’s been closed for 2 days now and I’m stumped as to why. The only things I have changed this past week is: 1. Switched from instant ocean sea salt to reef crystals. 2. Added uv sterilizer. Will be testing Paramus tonight but I’ve a feeling it’s not going to tell me much. Wonder if I should dip the coral and do another water change. Thoughts anyone?
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