how old is your tank and how much flow.
I had some brown algae on the back glass and it went away after about the fourth month.
I have a lot of flow though 800gh through a squid and two koraline 3's in a 24 gallon. 
What about your ALK what is that at?
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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