I have a 6x2x2 reef tank with loads of live rock. I already have an algae scrubber but it is far too small for my tank. It was made by a shop in yorkshire but the water outlet was much too small. I have since modified it ( drilled more holes ) and it is working fine. I clean screen each week and I an now getting chaeto like algae. I intend to make a larger version very soon as the concept of scrubbing is brilliant.