I had the same combo in a 24 gal at one time. Worked not too bad. If your going to try the firefish put a top on the tank. They love to carpet surf.
In a 14 I'd only go with 2 out of the 3.
My royal gramma is a real bully now. He was by himself for a while and when I introduced a new goby he beat it up to the point the goby had to be moved. I don't think they are all this aggressive though.
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