http://algaescrubber.net/forums/showthread.php?3015-Surf-2-Not-harvesting-after-6-months If anyone (who is not banned on algaescrubber.net) wants to PM lion-o and direct him over here, that would be appreciated. Something is seriously off when your scrubber grows no harvestable algae in 6 months, you are pulling algae from your display regularly, and the manufacturer says... ...and then resorts to the "phosphate leeching" explanation. I don't want this to drop into a beat down thread on the Surf2, I just want to help this guy. Because nano tanks are sort of the reason the UAS was invented in the first place, so if they're the only option for some, we gotta find a way to solve these kinds of problems. Something else is going on here and more questions are in order: What size air pump is running? Has lion-o tried adjusting the photoperiod? He mentions 22 hours, this might be too much (photosaturation) Has he tried calling the other lions and forming Voltron? Perhaps the Blazing Sword would help in this situation. Sorry I had to, I used to watch that crappy show religiously when I was a kid. I even kept my original Ban-dai die-cast Voltron for 20 years and sold it recently for a meager $5 profit. That's what I get for playing with it and removing the stickers.