Hey guys, so recently 2 of my corals that died for some unknown reason. I noticed they had some brown jelly on them. So after doing some research and finding out that it may spread, I quickly took them out and threw them away. Now another few corals are not opening up. so I’m confuse as to what is happening to my tank. Parameters are fine and I do weekly 20-30% water change. Can any of you help me?