Probably got real used to the tank set up and wasn't used to the tub. 125 is huge though.
I have some balls in displys and some in tubs. My displays are covered on three sides with black foam board so only one side is showing. I start all my balls in displays and the ones that show to be consistantly timid usually wind up in tubs and the ones that are fearless will stay in the displays. All eat real well for me regardless. I just like to see my snakes when they come out at night.
I do think they have different personalities and displays aren't for all bps. One of my lessers if it sees anyone will not come out of its hide. And is now in a tub. My Bee and Albino don't care whats going on outside they're enclosure, and come to the glass in curiosity, they're in displays. My Leucy (in display)will come out of her hide if you put your finger up to the tank or the dogs tail wags in front.She is fearless and will cruise around at night no matter whats going on. Most swear by tubs. It's definitely easier.