First off I’m sorry to hear about your losses, they can be very frustrating and sometimes difficult to identify. The good news is that I do see some green tissue left near the bottom, meaning it’s possible for that area to recover. The branches however look like they have some algae growing on them which means there is no tissue left there. Here are some things to check that may be involved:
- Do you have any stray current in the tank?
- Is there any chance there is any rusting metal in the tank?
- Did anything get sprayed near the tank?
- Is there any chance you lost power over the last couple of days and the corals were without flow/oxygen?
Unfortunately we may have to play the guessing game for a while to get to the bottom of it. If you are saying you saw white strings coming from the corals then that sounds like mesenterial filaments to me which almost always means the corals are irritated by something. Sometimes it’s no big deal and it’s a minor irritant, other times the corals are waving goodbye. Do you have any pictures from last night while the incident was beginning?
- Do you have any stray current in the tank?
- Is there any chance there is any rusting metal in the tank?
- Did anything get sprayed near the tank?
- Is there any chance you lost power over the last couple of days and the corals were without flow/oxygen?
Unfortunately we may have to play the guessing game for a while to get to the bottom of it. If you are saying you saw white strings coming from the corals then that sounds like mesenterial filaments to me which almost always means the corals are irritated by something. Sometimes it’s no big deal and it’s a minor irritant, other times the corals are waving goodbye. Do you have any pictures from last night while the incident was beginning?