hi everyone this is my first post ..so my apologies if it's all over the place ! but my tank is only thriving so well because of so many nights reading helpful advice on this forum so I thought I would give it a go myself. I have noticed my open brain shrinking away from its skeleton lately so I have been keeping a close eye on it as this coral is one of my favorites ( It has always had damage its tissue was torn in the LFS and never closed up fully but took it home anyway as I thought it looked interesting ) Then I noticed one night looking at my coral doing some nocturnal investigating that something moved Inside the walls of the skeleton So off I went searching the forums and came across " gall crabs " well after reading a bit about these guys and seeing my open brain clearly struggling open brain surgery commenced !!! I will attach the pics of after I pulled the bugger out and the hole it left !!! It took some prodding and pulling with some dental tools but got it out in the end after the surgery my open brain has immediately started to close over the skeleton and is not as stressed hopefully it will go back to being the pride and joy on the sand !