Second the marine grazer suggestion. Very easy to use. Also, do u have any fish in your DT that already eat nori? My foxface would not touch the stuff in QT, but once in the tank with my yellow tang that eats it he took to it quickly. It seems like the foxface is very interested in what the others are eating and joins in. A very hungry fish, but has not touched a coral yet and its been in there for a long time.