Hello. Pretty new to this forum. I've searched for answers and can't find the same thing so please help if you can. I have this white worm thing coming up near my Kenya Tree. I had a similar thing kill a Frogspawn last month but couldn't find any answers. It looks like a hollow tube on the inside. Outside it looks sandy. Yesterday, I noticed it growing near my Kenya tree. Remembering my Frogspawn, I tugged on it and it broke off, leaving a bit on the rock. Today it's grown larger. I found a similar thing on another rock (2nd and 3rd pictures) but it appears to have flowing tentacles. Please help me determine what this is and how to deal with it. Thank you so much.