Thx for the response SANTA and zenzzo.!!! . My scrubber is 9 by 7 inches and I didn't sand it ( should I still do it?).I am using the scrubber on my 125 fowler w/ 125 or more live rock. It houses a 5 inch emperor angel. a 13 inch snowflake , a 6 inch dogface puffer , a 5 inch greenbird wrasse ,2.5 inch picasso trigger, 2.5 inch brown tang and 2.5 racoon butterfly. My live stock has a very big bio load as you can tell. Santa , I did check my water before my algae growth. medium green for nitrite and medium orange for phospate via API test kit.Although it's bad, My fishes seems fine . When do i whipe my scrubber??? Is it time ( 1st pic) ? Santa, would you consider my 2nd pic a dual or triple scrubber?( I added it 2 days ago , any opinion good or bad ) I had some emperor filter pad and bio wheel. 3rd and 4th is the current scrubber set up w/ skimmer and the rest are tank shots.. THX again!!!