I think these guys (and gals) have pretty darn good eyesight. Our old male used to be able to tell the difference between my wife and me. He always used to flare at me, but loved my wife and didn't so much as open a single gill in her direction. He would get mad at me if I was anywhere in the room and he even used to flare at me when he could see me down the hallway from the bedroom he was in. That's quite a distance for him to recognize me.
We now have a a single female and she can see me all the way down the hall too. She gets excited and begs for food when she sees either of us and she'll even go over to the side of the tank and start getting excited if she sees one of us down the hall. (It's funny and cute how she does it. She swims over to the side of the tank we're on all excited and stares. Then goes to the hole at the top where the food comes in, looks up and checks, then swims back over to glare at us, and then goes back and checks. Sometimes, if she doesn't get food, I can swear she's glaring at us.)
So they can see quite a distance and I would assume quite clearly too considering that the male could identify me from my wife at that distance.
Last edited by Blacklight; 12-12-2012 at 06:09 PM.