i make frozen food for my mbunas
i just take carrots, peas and romane lettuce...blanch the the lettuce, cook the carrots and peas a bit to soften them, shell the peas and chop everything up, mix it up, put into ice cube trays (the smaller round ones) and when its frozen i pop them out and bag it up
not exactly vegetable wafers, more like frozen vegetable pellets but the fish like it, its easy to do and i'm sure its good for them...i even put some in my community tank every so often and they go crazy for it
--liz