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I have two pictures attached. These corals haven't opened up in two weeks, so I'm trying to decide what the problem is. My finger leather coral is doing great. One is my toadstool that has a hard "growth" on the side with a little black stringy thing. I have tapped it and it is solid - not soft...

Can anyone help tell me what this is? It just appeared in the last two days. Should I try to remove it right away or is it okay?

Hello everyone! I've been reading this site for months, and I figured that it was about time that I finally join it. I have a problem with my tank, and I'm not quite sure what to do now. I'm relatively new to aquariums, but I've done a lot of reading and research that I'm pretty confident on...