I do that with my cucumber, Sally. :3 Sometimes I'll put it in a small amount of water on a plate and put it in the microwave for fifteen-twenty seconds or so, that usually makes it NICE and squishy(extra squishy ;D) once it cools off. I just started doing it that way recently, and since I did my fry looove it, so do my snails. So much easier for them to eat.
Make foods so the fish can eat it without too much fighting with it and you can open them up to eating more good food that they should have in their diets.