I live near live aquaria and regularly pick up my fish from them. They were not in the bag and box for longer than a few hours. Never had any issues with fish from them being sick. If it is a bacterial infection will it clear up on its own since he is a health fish or need to be treated. Also does this pose a risk to other fish in my DT?

Earmuff
Earmuff
Earmuff
Hooded
Hooded
Hooded