Well, that's good news, about his swimming. If he was sort of crashing into the glass sideways I'd be worried about parasites.. But he's probably freaking out at the reflections on the glass. Try putting a bushy silk plant in front of his favourite glass-surfing place, or otherwise block his view of the reflection and see if that makes a difference..
Hey it's bubbaj2117. Ik the guy you helped out tester day. You asked, "is he swimming up and down the glass really fast, or if he is just normally swimming and then he suddenly zipps down the glass. It appears to me that he's mostly just swimming up and down the glass. Some times he might swim normal and then do a sudden zip, but not often.
P.S. Thanks for the other help on his white belly! I'll have to convince my mom to let me spend more money on this fish! Ha! She usually lets me if the tell her the new thing will stop stress/sickness.