Like any food you need to have a variety in your fish's diet. When I feed this I feed this 3-4 times a week and alternate with pellets. My guys had no problem switching back and forth between "Brenda's Own" as we call it and the regular pellets.
If you had any greens that a similar to spinach that could work. If not I would use maybe 1/2 a cup of the peas.. but make sure you take the shell off first.. just as you would if you were feeding the peas for constipation. Its really a sort of thing you have to "eyeball".. not an exact science :)