5500K is probably pretty good, but anything between 3000K and 6500K should work well, for growing macro-algae's anyways.
Cheatomorpha tends to be considered the best macro because it is non-sexual and tends to grow fairly well and in a controllable fasion.
Hope this helps, Cheers,
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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