it doesnt last long but it seems to fill them up. all my cichlids love it too. i actually have to give my female jack dempsey about a third of a sheet before i put the clip in the tank or she just takes it all. after that the sd's nibble at it until they are satisfied. i havent had a plant touched in probably 4-5 months. fish always take the easiest food, you just have to supply it.