Careful with lawnmower blennys. Make sure you see them eat at the store first. I didn't. Mine was picking at the rocks all day long but kept getting skinnier. I had halimeda, two types of caulerpa, and GHA galore at the time.. I tried formula 2, three types of seaweed, Rod's food, anything I could find or think of and he wouldn't touch it. It killed me because I liked the guy so much, but I had to let him go.