Water changes are key, there is excess nutrients in your water you need to remove. Also looks like there is a lot on the sandbed, look into possibly getting some sand sifters, and see about adjusting some powerheads to get more flow through the tank. Possibly overfeeding aswell, even if the fish eat all the food you give them right away, they still crap it out in the end making nitrates. I've been shocked how little i actually need to feed my fish, i went on holidays recently for a week and came back to find that my fishfeeder didn't work the whole time i was gone.... all the fish where happy.
best of luck, i just got over a big hair algae outbreak and it was a PITA.
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