Looks like majano/aiptasia of some sort. I dont think its really harmful except for the fact that it can take over your live rock really quickly and is a bit hard to get rid of if u decide u want to get rid of it to make space for corals.
Why we are on the subject of corals what do you guys use to secure them down? I got 4 ricordea sitting in seashells on the bottom of my sand but id love to secure them to my LR somehow. I superglue them to my seashell out of the tank but they are so hard to keep ahold of and superglue them down underwater.
Why we are on the subject of corals what do you guys use to secure them down? I got 4 ricordea sitting in seashells on the bottom of my sand but id love to secure them to my LR somehow. I superglue them to my seashell out of the tank but they are so hard to keep ahold of and superglue them down underwater.