I used to work at a privately owned shop near my house, and I can say from my experience the problems are mostly from the supplier side. Many of the feeders and stuff we get (from the stores) are from Thailand. This applies to all fish stores, regardless of your personal location. I'm sure there are a handful of stores that breed their own stock, but that would be a rare treat to find .
The major chain stores (PetCo PetSmart etc) usually have decent filtration on their feeder tanks, but that doesn't do anything about the myriad of disease the fish encounter/get between their breeding facility->supplier warehouse-> the store.
Bottom line is, if you're really having trouble getting good feeders, setup a large breeding tank or build a pond and throw some comets in it, you'll have plenty .
The major chain stores (PetCo PetSmart etc) usually have decent filtration on their feeder tanks, but that doesn't do anything about the myriad of disease the fish encounter/get between their breeding facility->supplier warehouse-> the store.
Bottom line is, if you're really having trouble getting good feeders, setup a large breeding tank or build a pond and throw some comets in it, you'll have plenty .