I saw some other folks that had asked questions about putting a turf algae scrubber in the sump of a Red Sea Reefer 170. I did it, here is the pic. This is an Algae Clean Scrubber ACS 10-SFS-G3. It appears to be an eBay only item direct from the person who makes them. The shelf is just the cheapest acrylic shelf i could find on Amazon. It partially rests on the sump. It is plumbed off of my return pump with a 5/8" 5/8" 1/2" barbed tee and a 1/2" in barbed valve.