A: It was the same dose but I used a bigger container this time. I put about 5 capfuls and used about 8 gal this time instead of 5
TBTB: I see. It would be better to say "it was the same quantity of the med" because you dissolved it in ~1.5 times more water, hence your dose was ~1.5 times lower because the dose (in this case) = concentration when talking about baths.
A: and I let it aerate all day this time because last time I only did it for about an hour.
TBTB: I don't follow this. Maybe I am not reading it right... When you pour your water in your bath container, it gets fully aerated (unless you start off with water totally lacking oxygen... but even then, most usually as you pour it in and it gets in contact with air and is vigorously stirred, it gets fully aerated). It cannot be aerated any more. I'd just keep a nice strong bubbler in it DURING the bath so oxygen concentration does not decrease.
A: What is a good med to help the wounds?
TBTB: My guess, as expressed above, has not changed yet: I'd try bifiran with food for internal treatment and pottasium permanganate for baths. It's a weak guess though too, I must stress again, because, as I said, IDK what deasease is eating your fish away. What you are doing on your LFS lady's advice is not unreasonable in my eyes, just not the first thing I'd try but I have been wrong plenty before.
A: I read the thread you showed me, but it was a lot to take in.
TBTB: Understood. It's a good start. You could just focus on the meds/diagnoses being discussed in this case for now... and keep reading here and other places too. This is, I believe, how we learn the best and the most - during trying times with our own pets.