I wasn't aware of anything eating Cyano, but I saw my Goby eating some yesterday. I have some small patches of Cyano in my tank. Yesterday I was blowing off some of the Cyano with a eyedropper and out of the corner of my eye I thought I saw the Rainford eat some. I sucked some Cyano into the eyedropper and squirted some toward my Rainford and sure enough he ate it. He won't eat the Cyano if it's covering something but will if it's floating in the water column.

