I want to clean my UAS after 14 days but I noticed the flow in the drain line from my UAS box is getting slower and slower as it past 7 days or so,because the algae on my screen gets really thick. Also the box front and back panel gets dirty. Right now I am running the lights for 9 hrs. Should I run it less than 9 so algae wont grow really fast? Or just clean it every 7 days? Or any alternative? Thanks for any recommendation. Pictures shows the dirty UAS box, the screen with thick algae and cleaned box ready for scrubbing.