Yeah, I know that too many can cause impactions. I will stop if I have to, but I only give them 2 or maybe 3 worms, one a week or longer between. Is this infrequency still enough to cause issues?

I hadn't even thought of parasites on the fish. I guess I just thought it would be like fish, if they ate them up there'd be no problems, since it's not like they'd be living together. Thanks for that. So quarantine tank for 2 weeks before feeding them, if I ever do choose to try feeder fish?