Am tagging along. I have an algae problem as well, I believe caused by detritus settling on rock due to low flow (unplugged during a water change and forgot to plug back in). Add nitrate and/or phosphate and the algae will show up. How to get rid of it quickly, easily and permanently... that's the part I don't know.
Do you know what kind of algae it is that you have in the main tank? Some common ones would be hair, bryopsis (looks like hair but with feather like ends), diatom, slime/cyano, bubble. I think with hair algae you need to manually pull out and then turkey baste because if it's long a lot of algivores won't eat it, and it traps more debris which rots and becomes a food source. Think of hair algae as a filter feeder. So pulling out what you can is good, then use a turkey baster or powerhead to blow the rocks clean and keep circulation high.
If you blow the rocks off a mechanical filter is good to remove the water clouding debris. HOT magnum or Magnum 350 with pleated filter will take the freed debris, or you can try and siphon it out as you go and do a water change. I like using powerheads with the sponge on them, when the water clears I bag the powerhead, unplug it and take it out of the water to rinse. That's the cheapo/easy method.
Slime algae should be siphoned out, probably also has collected debris under it for food. Bubble is trickier, I like to do that in another container as if you breat the bubble it releases tiny ones to just make more misery. The big ones can often be twisted off intact if you are careful.
Kate