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That should be fine. Julii do not get big, so space shouldn't be an issue. Both fish are so ridiculously peaceful that it should be totally, completely fine. I keep those species together and its great.
I have 3 Julii's, 1 albino and one green cory in my 55g with four black kuhli's and they do great. It's almost funny how much they act like the other one isn't even there.