Unknown thing in my tank

[Tryingmybest]

Hi! I’ve had this tank running for a bit over a year and I’ve seen this weird thing in it twice now, not sure what it is or if it is good or bad. I included some pictures, so if anyone knows what it is or what caused it please let me know! It has a weird clear almost mucus like thing around it. I am not 100% sure but I think I have seen a Oenone fulgida worm in that rock before. I assume it may be from that, so if anyone knows how to get rid of them, those tips will be much appreciated as well!

 

[DrkNMighty]

Almost looks like it could be from a vermetid snail.