It really depends on what exactly it is. For stumps, we've never done more than invert feeding, but in a tank with few filter feeders, this will likely cause more problems that it's worth. You could target feed it with the water you dissolve frozen foods in--might help, would be better than adding anything new.
But, I'd wait and see if anyone else has a better idea. As i said, I am a poor guesser on this stuff.