Anyone Know what these are? I know the pictures is not very clear. The tank is new, about a month old. They look kinda like little scaly eggs? or something along the glass of the tank. They seem to appear over night. there are 3 of them. they are scrubbed off pretty easy with the algae scraper. The only organisims i have added to the tank are Astrea snails, Narssisus snails, red legged hermits and a emerald crab. Any ideas?