Light doesn't cause algae, even old yellow light doesn't cause algae. Nutrients are the cause, and light is the catalyst, but without light nothing will grow. A proper reef tank will not have algae problems even with bright yellow lights.
Have patience. Do your 10-15% monthly water changes and keep those small hermit crabs and snails! Don't overfeed, and skim, skim, skim...
Good luck!
-Nathan
[ August 08, 2001: Message edited by: Nathan ]