CAN'T FIGURE OUT WHY

I have live rock in my sump/refugium. Corraline algae is more evident on the live rock in the sump than the live rock in the display tank. Has anyone experienced this? Why is this happening? Thanks.
 
Corraline algae does not grow as fast under bright light


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Duh! Damn, I remember reading that somewhere. I read so much about this hobby, but I can't remember what I read...LOL! Thanks, kuyatwo.
 
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