Hello all, I have a really bad problem. I set up my 36 gallon bowfront tank in January of this year. I have had algae problems since the first week. I have never had my tank algae free I finally cant take it anymore. It is getting worse. I do water changes every 2 weeks and my light hours (250 watt) are: 7 am-(4) night lights cut off (blue leds) 7 am-(2) actinic lights cut on 10 am-metal halide cuts on 6 pm-metal halide cuts off 8 pm- (2) actinic lights cut off 8 pm-(4) night lights cut on (simple blue leds) I use RO/DI water. PLEASE help me! what is this? how do i get rid of it? Thank you!