Hi , my AP700 is set at deep ocean blue from 9am to 1230pm then up to fourth blue level from 1230-330pm max intensity is currently 35% .normal intensity is max 65%. Been raising it after 5 day low blue only period. Lights ramp back to deep blue from 330- 730pm then only moonlight thru till morning. Raising intensity daily 5% (aprox) . I vacuum off rocks and sand mats at least weekly . My bio load is pretty high I feel ,so your correct that getting tank" cleaner" should really be the goal. Large water changes with vacuuming doesn't seem to help much. This is why I'm trying out bacteria attempt.chemiclean has been used in past and works but not for long. Plan is now to see if bacteria diversity along with regular cleaning /water changes corrects and minimizes this red scum. After this ,if still not corrected I may add additional live rock to system as I have only 100lb in tank, and think I may need another 75-100lb.Best regards,Jim.