Green algae on live sand

[likwid]

Hey guys,

I am running a 10g tank with a rio nano skimmer, AC HOB filter, and two powerheads in the tank. I have one clownfish and one Bicolor Pseudochromis. The tank has been active for 7 months now and I am having a hell of a time trying to eliminate the algae on my live sand. I have sugar sized live sand, and I keep getting a fine, bright green algae on it, which appear in clumps on the sand. I dont think it is hair algae, since it is very fine and sourrounds each grain of sand, making it green. I only feed 2-3 times a week with either flakes or mysis shrimp, and my light cycle is only around 8 hours a day. The sand bed is about an inch to an inch and a half deep, and I have tried stirring it, but the algae just reappears a few hours later. I have also tried syphoning during water changes, but it comes back a day or two later as well. I have tested for phosphates, and they are at 0. Currently I have 3 Astrea snails, 2 Cerith snails, 3 blue legged hermits, and 2 scarlet hermits. The Astreas stay buried in the sand and are useless on the surface of it, and the Ceriths just stay on the glass and rock. What can I do?