Hey everyone, I am new here, and to saltwater. Had a freshwater cichlid tank for 7 years and made the switch in October! So my tank is around 3-4 months old. 55 gallons. Eheim 2217 canister filter with GAC, purigen, chemipure elite. Two powerheads creating lots of flow. about 35 pounds of LR. Heater. JNS VS-1 HOB skimmer. Salinity 1.025, pH 8.2, dKH 8.5 Calcium 450 Phosphate - 0.25 ish Nitrate - 0 Ammonia - 0 Lights I have four LED reefbars, and a CurrentUSA Orbit Marine LED. Up until today I had a T5 that I replaced with the LED. Four more reefbars on the way. Lights on from 8 am to 5 pm. Live sand. Inhabitants: Black and white clown, Ocellaris clown, Six line Wrasse, Yellow fang blenny, high-fin red banded goby and a powder blue tang. All fishies get along and are super happy appearing. Corals: Candy cane Finger leather Bubble tip anemone Long tentacle plate Short tentacle plate Open brain coral Feather Duster Coco worm Xenia Torch Few hammer frags Zoa frag And a blue clam CUC: Nassarius snails, hermit crabs, mexican turbos, and a conch Anyway, the tank was great as of Monday. Corals huge, great colour, except the open brain which has been receded and retracting for weeks now no matter what I do. Came home from work yesterday and finger leather was sulking, anemone had disappeared into the rocks, Xenia was white and shriveled, my coco worm doesnt come out anymore. The torch had shriveled. etc... This happened literally within the day. I was not home. No one else was. So I added the carbon, did about a 20% WC. The anemone came back out today, but not the way he normally does. The leather is still sulking, the coco worm never comes out anymore (he used to be out every day all day), the xenias are still sorta shriveley. Is this chemical warfare? To happen so suddenly out of nowhere? Of note, I feed pellets to the fish every day. I dose with Aquavitro fuel every couple of days and reef roids. I supplement the alk with aquavitro 8.4, and a seachem 2 part system. Im so frustrated. I work so hard on this tank. Nothing seemed to have changed, and all the corals just crashed more or less between the hours of 8 am and 4 pm in one day...!?