Antibiotics? updated, with pics of my sick fish

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Since regulations have changed for over the counter antibiotics, and we can't buy Maracyn anymore, where do people get antibiotics to treat their fish.

I've had a newly purchased coral beauty in quarantine for about a week now, and it has begun to show signs of an infection.

Should I make a call to veterinary clinics to see if I can buy some that way?

Does anyone know the names of anything I should ask for specifically?

Thanks, Myles