Jelly like “thing” on glass, some LPS and other surfaces that don't really move or are scraped. Come off easy enough without damage to what they are sticking to. I have searched for them as jelly , spider like, or fungi and other critters but not able to determine what they are. They are actually beautiful to look at, like nebula or what not, which makes me afraid I am looking at my new worst enemy. Tank volume is 150 gallons and it is 18 months old, mix LPS and SPS, loads of fish, snails and shrimp….nothing eating these things. Thanks for the help.