Throw those away, or feed them to somebody else.
Those are not the brine shrimp you want.
Fry get freshly hatched baby brine shrimp...not because brine shrimp are terribly nutritious, but because the yolk sac that BBS carry is highly nutritious.
Te method seems fair, we want the med in the food. The only change I would consider would be using something thats freeze dried as the "carrier food".
Salt probably has the opposite effect, as it stimulates slime coat production IME
I would think the slime is unrelated to the worms if you are using the fenbendazole in their food.
If you are trying to dissolve the fenbendazole in solution to medicate the tank, you've got delivery issues, and it may be related.
I’d generally agree with ^^^^….with the exception of mollies. Mollies have oddly short digestive tracts, which makes them pretty inefficient processors of food. Being so inefficient at processing food makes feeding them more often, more important, as they just don’t get as much out of the food.
Not to be a negative Nancy, but if you really don't have time for maintenance, fish probably aren't the right pet. 2-4 weeks, becomes 4-8 weeks, and 4-8 weeks becomes why are my fish sick and dying pretty easily.
If you've already figured out how to turn BN into a profitable fish, there's only one way to go....and its down. Find something you think is really neat, and breed away. Have some fun, cause you'll never match the profitability of BN IMO