Ok i think this is diatoms but i don't know and i think it is getting out of hand. I dont know if i have made a huge mistake or not but every time i do a water change (once a week) I have been taking a tooth brush to my rock to rid it of algae. I do turn off all pumps and i siphon out as much as i can when brushing the rock. \r\n\r\nI am getting these bubbles every where but the spot in the photo is the worst and it is also the closet to the lighting in my tank. I have the lights on for 12 hours a day and 2 of those hours are just the 2 blue bulbs. \r\n\r\nThis has always been a problem for me but ever since i got my new light it has exploded which was a week and a half ago. \r\n\r\ni do also have another form of algae i am getting but you can see it in the picture due to i brush it all off. It's a brown seems kind of slimy and hair like. Would that be still diatoms as well or something worse?\r\n\r\nI do use R/O (not RODI) water from a local food store when i do my water changes. They also have a chart that says when the system was last checked and they seem to do it about every 2 weeks. I do plan on getting my own system once uncle sam gets me my money back.\r\n\r\nKeep in mind i did my last water change saturday night and it is now worse then ever before.\r\n\r\nSo heres my questions what do i need to do to get rid of this problem? what in the world in causing it? and what is it? \r\n\r\nAlso will this kill coral?