Hi,
Best coraline algae eater are the long spined black ones, with the little red butt. He never bothered a thing in my reef....HOWEVER, plan to remove the critter after the algae is gone, they starve, even in a tank loaded with algae...mine lasted a tiny bit over a year and then it ran out of algae, I had hoped that one area would grow out while it fed in another, but no...it lost it's spins until it looked like a pincushion....I managed to get it out before it died. I had coraline so bad on the side glass that even a koralia PH wouldn't stick with a magnet. Now I can see through the glass, it only has a few dots of coraline left.
Mine was huge, so purchase a very small one, and you might have a better chance.
