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If you used new sand it's likely diatoms. They consume silicates (comes in with new sand) and will normally go away once the silicates are consumed. You can try adding some turbo snails some have succes with them and diatoms.
Also when you do a water change take a hose (larger than an air hose but smaller than one of those sink connection hose) and siphon into a bucket. Use the hose to target the diatom.
Looking back through some older post and found this,
I think I am going through the same thing at the moment. Ive had my 70 gallon set up for a year with a 10 gallon sump. Ive recently moved my tank and added a 40 breeder sump, as well went from a bare bottom to sand. I have 1 turbo snail so hopefully he eats up, but is there anything else I can do to help this? or is it something to just let run its course?
I have one of those cheap LED grow bulbs over the tank just give it some better color and shine, and the brown growth seems to be concentrated directly under that light. I turned that off last night and have just been running my LED strips on blue just so i can see in the tank.