I have 3 feather dusters...one was open all the time...the other two less often...water params. all good...10 gal reef...now, they've essentially stopped opening..before I turned the light on this morning, they were open...lights on=closed all day...I've tried different positions for them...softees all looking good...I'm dosing with No3-PO4-X...any clues?...Thanks...




