There are all kinds of algae out there so we need to nail down what it is you are trying to combat.
First, I would start by getting a couple of urchins and let them go at it for a bit.
Second, crank up the flow. I had the same issue with the frag tank even though it was sharing the same sump as the spotless main tank. The issue here is due to lack of flow, nutrient gets trapped in the frag tank which in turn feeds the algae growth sorta acting like a algae scrubber for the main tank.
Lastly, clean up crew like Mexican turbos and some trochus (think thats how you spell it).
Show me a pic please.
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