What a coincidence, I, too, bought these guys today...
I did a search for blood tangors to try and figure out what the Ruby Tango is. Nules, I suspect. I wonder what the implications of citrus greening are for those people who bought the trees, now.
I thought that the Ruby Tango was quite excellent, and better than cheap Moros. There was a bit of a floral wine taste. It was pretty sweet.
Gold Nugget was basically just very sweet tangerine. I wasn't really that impressed, because there was no nuance in the taste.