Stressless water changes!
Well I have finally taught Chance how to swim into his cup so he doesn't get all stressed while I chase him around to get him in the cup. I would dangle my fingers in the opening so he would swim in and then I'd quickly scoop him up so he couldn't panic and swim back out. I'd feed him once he was in the cup. I did this everyday, whether or not I was changing his water. Now he just swims right in! I dip the cup in, he swims in, I scoop him up, feed him, and he waits very patiently until I'm done! Ta da! No stressful water changes!