My fish are on a flake and algae diet. I've seen people put zucchini in their tank for the fish to nibble on. I was wondering if I should do this. How much and how often? Also, many times I'm gone for the weekend. I don't let other people in the house feed my fish, and I know they are okay going for a few days without food, but I'm wondering if a wedge of zucchini would be a good thing to give them before going away for a day or so. Any other fruits or veggies I can use as well?