Thanks for the feedback. I would put it in with my rays, so can't go without bottom tankmates or feed only floating stuff. Last time I tried to feed lighter, but after a while it would steal from the rays anyways. Water quality is always great for me, I believe in drastic overfiltration and huge weekly water changes, so that can't be it. Genetics seems improbable because I have kept many wild caught babies and they all developed in at least one eye. Looks like I am either going to have to be alright with the drop eye or go with another species. Thinking of trying a big group of african butterfly fish with next set of baby rays. Got the idea from another post.
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You can try a lot of things and they may work, such as creating, as above said, an environment where they do not have to look down. Some even keep ping pong balls floating in the tank, for chrissakes.
I have kept tens of silvers, and I do not think that any of those has not had al least one DE.
Like everyone else has said.... No one will ever know. But common things believed to help avoid drop eye are the use of ping pong balls and avoid over feeding. I read somewhere that drop eye occurs from 1 of 2 things. One is from an I jury like hitting the tank or the lid. Another is when it is over fed or given poor quality food that creates fatty or scar tissue behind the eye. This then builds up and creates the drop eye. I've only kept aros till they were 23-24 inches and I never had drop eye in either silvers or blacks. But from there I sold them and now Idk how they are doing.
also forgot to add another piece that i read. make sure you have a bottom substrate. if the arow is in a glass tank with no gravel or sand or substarte of some type, they will constantly look down at their own reflection which is believed to cause drop eye. like i said this is believed to be a cause of drop eye. not a for sure or proven theory. just throwing it out there to see if it helps with your situation