Hi Stew,
Mine have peas about once a week (microwave for about 20 seconds, take shell of cut into small bite size pieces, when cool feed to fish, i use about a pea each)
It helps with digestion, if you fish get SBD it help clear them out

The have had carrots but they didnt like them as much, the do like cucumber remove skin & seeds & chop up small for em'
The is a post somwhere is with along list of food.. see if i can find it..