Originally Posted by Kurt_Nelson
It will grow back on its own without the PurpleUp, as others have mentioned. But as long as that urchin is in there, he'll keep eating it...
Research what kind of urchin you have and compare photographs with that of the ACCURATE online research engines. Most cases, urchins will naturally STRIP DOWN all that beautiful algae and it'll take several more months for you to build it back up IF you don't have the urchin anymore. That's some of the throwbacks of having a saltwater tank. You want certain cool things, but sometimes those cool things will clash with others and it's not a very nice mix. RESEARCH RESEARCH RESEARCH