My local fish shop has a 160 gallon with a 6" "porcupine puffer" that looks like this:
Porcupine Pufferfish, Porcupinefish - Diodon holocanthus
I'm not sure which species that it is, but it has beautiful blue or green looking eyes. I looked at an image of Diodon hystrix, and that is not the fish that I am seeing at their shop.
Here is a photo of the fish that I want, it appears to be Diodon holocanthus. So is the balloon fish different than a porcupine puffer? Bluezooaquatics.com lists it as a porcupine puffer.