Diatoms, cyno...?What color is it as its not the greatest pic...we need more info, flow,filtration, feeding, how long yor tanks been going....i feel confused just lookin at the pic bro. Let us help you ;)
its like pinkish..i only happens on the sand right under the powerheads at the ends of the tank. i think i might have a better flow now that ive reaaranged them but im gonna go ahead and add one more powerhead soon.