lights off for 2 weeks or salaris blennie they eat the stuff like a lawn mower hense the common name lawnmower bleenie. Once the roots are layed down there is no getting away from it but lights out for 2 weeks will likely kill roots. I'd then get a salaris blennie after you may need to put a clip of Norri in the tank but mine eats frozen and flake so I'm good. My bared gobies eat frozen like its going out of style they will now eat flake also just to let you know everything adapts at different rates.

Bill