I have little white things that are getting all over everything, they are hard like a snail and don't move there are a ton of them on the baffles in my refugium. Can anyone let me know what they are and what they do.
Possibly tiny tube worms/featherdusters. Hard to say with out more info or a picture. Look to see if they have a small feather head that retracts when you get close or block the light. I have a bunch in my tank. They are a good thing.