New saltwater aquarium enthusiast here. Set up my 18 gallon tank about 3 months ago. Currently have a two headed frogspawn, a clownfish, and a mandarin. I have also had a leather coral for about a month and a half. Right when I got it, it was pretty finicky as to when it would open. I moved it around the tank and finally got into a sweet spot if there is such a thing. There was a stretch of about a week where it didn't open and didn't look very healthy. I noticed a decent sized bristle worm hanging around it one night and removed it from my tank. Shortly after that, it opened pretty regularly again. Within the last 4-5 days, I've noticed a white spot on one of the fingers. It seems to get a little bit larger everyday, and where it is white, it doesn't bloom. Question is, should I be worried about it? I've read on numerous forums that white spots can indicate that it is self-fragging itself. I just wanted someone elses opinion on the subject matter, so I know its not diseased or anything. Picture is attached. Thanks for your help! 18 gallon tank Salinity- 1.024 pH- 8.3 Nitrates/Nitrites - 0 Temp- 80 degrees KH - 180 I've got a few hermit crabs as well that hang around on top every once in a while, but I've never seen them damage it.