I dont mean to highjack the thread, but Im dealing with this kinda dinos now. No bubbles in them, they go away at night, come back in the day, looks like diatoms. My tank just turned a year in January, and I started with gulf live rock, so I know its good and cycled. Ive got coraline algae everywhere, and corals are doing well. These just started showing up about a month ago. Do you have any thing to suggest to help fight them? My no3 and po4 had bottomed out to 0 at the time this started. Ive been dosing neophos and neonitrate for the past week now and have no3 up to 5, and po4 just started to show a little color on the sailfert test. Its not getting any worse, but its not really getting any better either.