Sick cory?

[Corytank]

Hi,

I have a bronze cory with no eyes. He has just started to swim in a repetitive circle against the wall of the tank. The other 4 corys in the tank are all acting normally, and the ammonia and nitrite are at zero. What could be wrong with him?

I don't want something to impact the other healthy corys. We bought him accidentally with no eyes and figured we'd just keep him.

Thanks.

 

[V227]

I'd probably just put him out of his misery. Maybe a birth defect or lost his eyes to a bacterial infection; no telling.