I would feed the peas a couple of times a week as many as he wants, if you feed the meat (shrimp, mussle or Salmon) once a week I would feed some peas with the meat, a few peas, a piece of meat and then some more peas, to keep things moving along. The pellets you have should make up the bluk of the diet. I posted in another thread that when I would feed krill as an example I would notice stringy poop for a day or two afterwords, the shell I think was the main cause. Although meaty foods in general seem harder on their digestive systems and tends to consapate them if feed to often.