Where did the sand come from? If it's used, or mixed up from an old tank, it could be releasing nutrients. Same with rock, if it's been moved from an old tank, it could release nutrients.
Skimming is important, as asked already, what are you using?
Water changes are the single best way to get things under control. Use RO water, good salt and don't be afraid to change 50% at a time. The typical 10% bi-weekly won't do any good.
What kind of food and how often? Easy on the flakes, and rinse frozen first.
Sand bed cleaners are good in preventing some of this stuff, but right now they'll just recycle it. For the algae pictured, you want to get it under control before you expect a fish to maintain it.
Lighting looks like MH? Is your bulb reasonably new (less than a year)?
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Brad
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