One of my peacock cichlids has a translucent whitish film over one of his eyes. After researching on Fishfarmacy i think it is a gram negative bacterial infection that i need to treat with an antibiotic. My question that the site didn't answer is do i seclude this fish and treat it alone or does it hurt to treat the whole tank with my other cichlids in it??

Its popeye BTW. treat the whole tank.