My 1 in. red may lose his eye. Hase a case of pop-eye.
I had a cycloptic P once and I think it lived a fairly normal life. I've often seen them in pet stores with a single eyeball from fighting with eachother. LPS will sadly cram a bunch of them in a tiny tank.
This would result in numerous injurys....Along with goldfish, the Piranha is the most abused and mistreated aquarium fish on the market!! 
I had a cycloptic P once and I think it lived a fairly normal life. I've often seen them in pet stores with a single eyeball from fighting with eachother. LPS will sadly cram a bunch of them in a tiny tank.
This would result in numerous injurys....Along with goldfish, the Piranha is the most abused and mistreated aquarium fish on the market!! 