I have a small amount of green hair algae on my rocks even tho nitrates are 5ppm and phosphates are 0.03ppm. It's a coral only setup and I currently have one peppermint shrimp and 4 hermits, none of whom seem interested. Is there any cuc who eats it or should I just brush it off the rocks? Like I said, it's not bad. And I've given up on turbo snails because the hermits keep eating them. I'd like to add maybe a sexy shrimp or other inverts for some movement. It's a 12g nano.