I wasn't blaming your situation on the supplier, just tossing that out into the mix as an unknown. It just seems rather odd that a local breeder can convert an entire fishroom full of discus to 1mm NLS pellets, yet for the most part you are having difficulty getting yours to eat pellets, period.
The difference between your situation and the OP's, is 1. his fish were all eating the pellets for approx 1 month, and 2. he's feeding midas, which IME over the years are gluttonous pigs, compared to drama queens such as discus.
I posted on this thread trying to find out why or tricks to get them to eat NLS.
If anyone is serious about converting their fish to
any type of pellet food, here's what I typically recommend.
1. Stop feeding all other foods. Don't give the fish a selection, and they will learn to eat what you offer, not what they find more appealing. Most children find candy & cake more appealing than meat & vegetables, but that doesn't equate to the former being better for them.
2. Make sure that the pellet is not too big for the fish, if it is, often times it will be rejected, or at the least excess chewing will cause fine particulate matter to get blown out of their gills & mouth. Not only does this cause excess waste in ones tank, it also is a waste of money.
3. Feed the fish once in the AM, if they reject the food try again the next morning. Eventually almost any freshwater fish will give in once they get hungry enough.
4. For the ultra picky eaters, "lightly" soak the pellets with tank water. Just enough water that the pellets soften up, but water soluable nutrients don't leach out. Once they begin eating the pre-soaked pellets eagerly, over the course of several days slowly decrease the amount & length of soaking until they are eating the pellets right out of the jar.
Personally I have never once had to use products such as garlic guard to train a fish to eat pellet food, and the steps listed above have included scores of species, with many of them being wild caught fish. Fish that up until they reached my tanks had never even seen a pellet food. I've seen juvenile discus that were raised on beefheart converted to NLS, and even fish that had never eaten anything other than bloodworms.
For the vast majority of fish, once they are trained to accept a certain food, they eventually learn to eat it with great gusto. This is why I am puzzled by the OP's situation. These fish were clearly already well trained.
HTH