Hiya all...... I haven't posted here yet - but, Viper - to answer your question. I also have hair algae, AND YES - I am using a BLV DE 150watt Metal Halide.... (Had one 14000k and one 20000k -the 20000k blew.... the hair algae mostly grew where the 14000k was shining)......
BUT, I now have a phosphate reactor, I have shortened my lighting period, have nearly 0 nitrates (VERY close to), have a bristtle-tooth (or pencilled) tang/surgeon (to help with eradication of the hair/macro algae)....... 2 skimmers, and am keeping my hardness quite high (alkalinity/calcium bicarbonate)..... as well as my calcium levels quite high (not sure about my magnesium levels - am not dosing magnesium specifically and don't have a magnesium testing kit either).....
AND am using kalkwasser.......
BUT, I now have a phosphate reactor, I have shortened my lighting period, have nearly 0 nitrates (VERY close to), have a bristtle-tooth (or pencilled) tang/surgeon (to help with eradication of the hair/macro algae)....... 2 skimmers, and am keeping my hardness quite high (alkalinity/calcium bicarbonate)..... as well as my calcium levels quite high (not sure about my magnesium levels - am not dosing magnesium specifically and don't have a magnesium testing kit either).....
AND am using kalkwasser.......