Natisha, that's the plan! I just don't want to start any more drama at our barn... There was one trainer that got kicked out because of the drama and I want to do my best not to disturb the peace while still addressing the issue is all. :)
Kayella, that's probably the way I'm going to have to do it. Fortunately his stall is right in an area where it's easy to stop and talk.
Jaydee, I'm not sure about him drinking abnormally or the part above the eye protruding (didn't know to look, thanks!), but he never seems to be very energetic when they bring him out and he's certainly not happy in his stall. He pins his ears and shakes his head up and down at any horse that passes by and the rest of the time just hangs his head out looking bored or tired.
I know these people really love their horses, and they love this one to death just as much even though they aren't showing him. All the kids get way excited to bathe him or turn him out or groom him. It's really heartwarming to see that kind of love put into a horse, even when they don't realize he's probably hurting. I only hope that they see it as me trying to love him as well!