Thats really cool, wish I could see it in person. From the pics I've seen, it looks like a pretty nice store. These friends just got back from a visit last week, and said he had a Lionfish the size of a basketball!!
Only thing I could suggest with the Bubble is to put it in a decent amount of light with lower to moderate flow, too much flow will keep it deflated. Also they do like some meaty food once in a while, crushed up anything really, sprinkled over the top. Mysis, brine, even meaty flake would work.
Best of luck with it!