I wouldn't second guess BB, she knows tons on betta disease. So glad she found us here actually (even though it was quite the accident!)
The disease she speaks of sounds a lot like a fish version of rabies, swimming in circles really fast like that. Could it be a virus instead of a bacteria? Is it like the disease you can get from swimming in lakes with fish sick with this, heard of that, or is it an aquarium fish thing?
Either way I'm going to have to agree- if it's eating the brain you're out of luck. Please inform the fish shop that the fish is a potential environmental hazard, as well as to every other fish they own.
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