I'm sorry you spent the extra money, but personally I would have done that anyway. I've spent more $$ on fish stuff, too, lol. I spent probably $75 - $100 on a $3.99 Brochis splendens that was my favorite fish, getting him over Columnaris and septicemia.
I do believe the garlic will take care of some, if, in fact, not all internal parasites, if not by killing them all at least in reducing numbers to a manageable level for the fish.
I haven't seen a Jungle lab medicated food that says it is anti-bacteria and anti-parasites, but that may be a new product and would be great to have and use instead of just straight antibactieral food.
Is it possible you are seeing undigested tiny bits of garlic? Nice solid tubular poop is normal and what we want, and I'm guessing the orange color was from the color in the flake you were feeding him.
If his poop is mucousy and slimy looking, thready, small pale lumps strung along on a filmy thread that looks like empty sausage casing (if you have ever seen that or know what I'm talking about); some of my family hunt deer and we'd make deer sausage out of some of the venison, so I've seen a lot of sausage casing, lol.
If his poop looks like that - he may very well have parasites. I hate for you to have to spend more money, but if you did see an anti-bacterial/anti-parasitic medicated food then I'd get that and have it on stand by. We can wait a bit and see if the garlic helps his poop start looking better.
Certainly, if his poop starts looking more like I described, or if his tummy looks swollen, I'd start the anti-parasitic food.
If the product is not a combo, but is anti-parasitic only, then I'd alternate the pellets: one and then the other every 5 hours as you are doing.
If he looks at all like he's getting bloated or constipated do another tiny bit of garlicky smushed pea to help with that.