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So, I originally posted a similar thread on a different forum. I am in need of some help. I'm not sure what is going on with a few specific acroporas in my tank. Seemingly without changing anything about my reef, poly extension has been slowly degrading on a handful of acros. I'm not sure what has caused it. I've checked for pests, even at night with a flashlight. No bite marks or any sign of irritation of the tissue. The zooxanthellae is dense in all of the affected corals. Before we go any further, here is the obvious stuff: Display - 120 gallon Lighting - T5s (4 Blue+, 1 Coral+, 1 Purple+; 2 Blue+ are on for 10 hours - 2 Blue+, 1 Purple+, 1 Coral+ are on for 5 hours) Bulb order front to back is 2 Blue+, 1 Coral+, 1 Purple+, 2 Blue+ Flow - Two MP40s on anti-sync Reef Crest at 100% (24/7), return is a Vectra M1 on 75% Skimmer - Vertex Omega 150 (24/7) Refugium - Live rock, MarinePure block with chaeto lit opposite display lights Mechanical - 2 filter socks changed every 3-5 days Fish - 6 small fish Parameters from Tuesday (5/23)- Alkalinity - 8.4dKH- Calcium - 450ppm- PO4 - 0.00ppm- NO3 - less than 3ppm- Water temperature - 77.6F- Salinity - 1.026SG/35pptHere is my original thread with others' replies and more information that I might have over looked here in this post: https://www.reef2reef.com/threads/sudden-rise-in-calcium-inhibit-polyp-extension.304677/#post-3776996 Please help. Even if its something super obvious or something you don't feel is worth posting, please post it. I really need advice as I am running out of ideas myself. Thanks, Evan