i've been debating whether or not to get a tuxedo urchin. Lately I've been having some serious algae issues, even hair algae, which hasn't been there since i first started my tank. I know what the cause of ithe algae is but i've been meaning to get something to clean up some algae anyways. Most of my corals are large enough that i don't think the urchin can knock them over. Is this really the only issue with these?