paulace2372 said:It may not be what I am about to suggest but I found something similar in my reef a while ago and found it to be...
LFS have been known to use fine wool like string for attaching small crops / gardens of polyps & soft corals etc to live rocks and selling them as a one piece garden. I purchased a few of them a while ago and this is what I found it to be, it had me guessing for a while! You had any recent additions?
paulace2372 said:I would say its unlikely to be honest, my other thought was that it may be a rogue thread of filter wool? Mr X is usually excellent for ID'ing things. If he doesn't know what it is my guess is few people will - he seems very knowledgable!
mr_X said:i don't see any white stringy stuff, but vermetid snails are known to extend long web-like strands of white mucous. it's used to catch food that might be floating by. try for a better pic.