i got 6 rbp in a 135, lots of cover, plenty of food and out of 6, 2 have no damage, 3 are missing an eye and one has no eyes. ive had piranha on and off since i was a kid in the 80's, have never lost an eye, ive had them kill and eat eachother but this is just eyes, no other damage, when i got the 6 one was missing an eye, i thought it was kind of cool, now that the pack is eyeless im not so impressed. none of the feeders are missing an eye. strange **** man, anyone have any input.....besides safety glasses