I'm having an issue with my LPS corals. The ones I have are a pink branching hammer head, an open brain, and a fox coral. All three of which are letting go of the skelletons. I've had these three for about 2 years now. Have not moved any of them other than initial placement trying to find a spot they liked. I first noticed the problem about 3-4 months ago. What can I do to help them heal? Detailed info provided below in categories. SUSPECTED CAUSES: Phosphates (ran out of tests, can't give a reading, more info below) Kenya tree coral (I've read they use strong toxins for territorial disputes. more info below) Improper additives (info below) Salt mix (info below) PARAMETERS: amonia, nitrites, nitrates 0 , salinity 1.024 or 1.025, using RO/DI for water changes and top off. PH 8.2, Calcium-it appears to be about 450 mg/L, I have difficulty reading this test, need a new one. Phosphates have been a constant battle even when there are no fish in the tank. If left untreated they spike to 1.0, so I use a phosphate sponge once a week and have been doing 10 gal water changes on a 29 gal tank every other week. CHANGES RIGHT BEFORE PROBLEM STARTED: Accidentally bought wrong salt. regular instant ocean instead of instant ocean reef crystals. added the Kenya tree. Changed from using Coralvite & essential elements & Kents liquid calcium to Kent's small reef 2 part system specially made for biocubes. (noticed the problem within a month or two of switching chemicals) ACTION TAKEN: switched back to original Kent's Coralvite, Essential elements & liquid calcium (2 months ago). switched back to reef crystals (1 month ago). Kenya tree experiment: moved Kenya tree to QT for a week. LPS improved, puffed up fully & stopped receding. Put Kenya tree back in, problems returned. Got rid of Kenya tree (back to LFS a few days ago). Started adding Kent's Coral Excell to stimulate coral growth (1 month ago) Any suggestions would be appreciated. thank you!