$50? Wow! That's a lot for fish meds, at least from my perspective.
I catch tropical s/w fish locally during summer. As my children catches them with nets or diy contraptions and sometimes with their hands, fish can receive minor cuts and scratches. I have very very high success with Bacitracin Ointment which I saved after expiration date to be used on fish. I dont know why but Bacitracin worked better than Neosporin on the fish.
Just simple smear on the open flesh is enough as any extra will just fall off becoming added pollutants to tank..
Somehow, I cant open you vid.
Perhap it is my imagination but loss of weight due to bloated belly. Maybe she is not ready to spawn, rather infested with worms. I dont mean to alarm you but fish seems very thin on dorsal area, imo.