Controlling algae

[dtum]

I got a 35g+ section in the sump dedicated to frags - frags are doing great under Radions, but the algae is driving me nuts. I got no algae of any kind in my main 180g tank (probably kept at bay by my 5 tangs), but in the frag tank I don't have any clean up crew - turbo snails would break my frags, hermit crabs would get to my return, etc.

My water parameters are good - just a hint of nitrates (I'm actually dosing them) and my phosphate is around 0.02-0.04.

Main tank is SPS and looks splendid.

What can I do about algae in the frag tank? Please help!

 

[organism]

Without a clean-up crew your options are pretty much to either clean the water or cut the light cycle and turn the whites down a bit.

 

[dtum]

Without a clean-up crew your options are pretty much to either clean the water or cut the light cycle and turn the whites down a bit.

Thanks, I have already turned off almost all white, so my program is primarily blue only. Algae is still growing, do I want to go for 0 nitrates and 0 phosphates? I think corals will suffer then.

What do other coral propagation specialists use?