Nothing sounds out of the ordinary for a healthy fermentation.
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Belma is boring, I wouldn't waste your time. Very little hop character. It's nice in something light like a blond ale - it has faint melon notes, but won't do anything in an IPA.
I'm not sure I would be too confident about whatever bugs have found their way on to grocery store oranges. Just imagine the places they have been before they made it to your beer. I guess it doesn't hurt to try to ferment with them, but I would be sure to test that the pH has dropped as well as the gravity before I put it in my mouth.