Have you tried picking up the algae? It might be easier than sucking it up. You could try reducing the amount of time the tank get, but 10 hours sounds fine to me.

Best bet would be to get some fish that will disturb the sand should stop the algae growth. Cories would be good but a pH of 7.5 is at the high end for them. Loaches would be another option, but they would eat your glass shrimp. There's quite a few smaller species of Botia, don't go for Clown loaches - they end up too big and sometimes nibble plants.

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