I got the large magnet cleaner for a 120-gal mix reef. It works well. I like the low profile of the scrubber. My previous Mag-Float was a little taller and sometimes got stuck between the rocks and the glass. The metal scraper removes coralline algae effectively, although, be careful not to remove the silicone sealant lining the corners of the tank. The felt pad on the handle was glued on crooked, bummer, but hidden and still functional. The handle is a little small for a good grip. I noticed thSee full review