Normally lights are not the only cause for algae growth. Give some more information on your tank that will help with giving you correct information back. I would not recommend running a alternating schedule on your lights as I would think it would have negative affects o your coral. This is just my opinion so maybe someone else can add more truth that. If you are running MH I only run mine 8 hours a day and actinic for 10 hours. If you could give us some water test results, size of tank and how ling it has been running that will help. |