Some more things to consider....how old is the tank?....how old are your bulbs?....how long do you run your lights for?.... how often do you feed?....although euro-reefs are good skimmers(Im running the same skimmer) it may be borderline for your volume of water....but it doesnt sound like you have a high bioload.....something is feeding that algae
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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