hi guys . last Sunday i stripped down the screen and went to town on it with a hole saw both screens both sides then sandwiched back to getter there now very cactus rough , also returned the reflector so its just on the screen area and not all round the sump , and widen the screen slot , all this has made a big difference , as the screen as got a nice covering of algae already , i will post pic on Sunday after cleaning , there's now 600 watts of lighting ,