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Hello All! As the title suggests, I have a green bubble coral that is currently undergoing some tough times. The lower-center portion of the skeleton is gone, but I still get decent extension from the remaining sections of the coral (I'll have pictures posted below). I've had this coral for roughly 4 months, and prior to this injury it would be roughly 9 inches across. This all started after a 20% water change and i believe, but not a 100%, I bumped the coral. I didn't notice any popped bubbles or severe pressing/pinching. This was roughly 2-3 weeks ago from now. Since then, the coral has shown progression and regression in different facets. The coral originally excreted a brown, mucous-like substance, but this stopped roughly 10 days ago (originally thought the coral had brown-jelly). Since then, the sides extend to a decent length, but the middle slowly is deteriorating. Any help would be greatly appreciated and tank specs will be below. Thanks! Tank Setup: 14k white LED's with moonlights (low to moderate lighting) (bubble is currently in a moderate-light location) 532 gph (2 pumps alternating on wavemaker) (anywhere from low to high) (bubble is currently in low flow) SG: 1.026 Calcium: 440 Alkalinity: between 120-140 mg/L (had to use test strips because kit was out of date) nitrates: <10 nitrites: 0 ammonia: 0 also have been using recent iodine supplement (has opened better since using supplement) Tankmates: 2 percula clowns 2 3 stripe damselfish 1 yellow-tail damsel toadstool leather eagle-eye polyps green-eye zoas kenya tree purple-tip, green bubble anemone red trachyphyllia green star-polyp The photos below in order are: the bubble closed up for better view of injury, the bubble a week after injury, the bubble two weeks after injury, the bubble a few months ago pre-injury