I didn't read every post, so forgive me if I'm redundant.
Glofish are very peaceful/friendly fish, they're a type of danio. If you see a zebra danio (sometimes called zebra fish) at the pet store, they're essentially the same fish. They genetically engineered the natural ones to be flourescent. The bad thing though, they will not breed, ever. It's impossible.
Rule of thumb, danios will probably be happy with anything that isn't big enough to swallow them. So long as your other choice of fish is also peaceful, you'll have no problems.