My Tiger Barp Has Lost An Eye. This Happened To Anyone Else?

[creg1]

My tiger barp has recently lost an eye, has this happened to anyone else?

 

[Fishy friend2]

It is probably because you have a red tailed shark and they are very territorial and need a tank of 55 gallons or more, and if you had more than 6 tiger barbs then it might not have happened. you should really get some more tiger barbs