I have trouble feeding my fish peas. Is there any other laxitive type food I can feed my fish?

You could try Spiralina.......Thats a aglae based food it might help

I think I read somewhere that spinach has a laxative effect too.

you can try romaine lettuce while your at it
all vegies help with digestion

Could I feed them parcley, I have heard that is good for the digestive system

parsley is great...if your fish will eat it. Most goldfish dislike the taste. adding it to a homemade food is a good thing too. it is full of vitamin A and C and other stuff good for fish