Gobies and blennies usually don't fight. These two aren't competing for the same food source. You may see some gaping and blustering establishing territory, but probably no fight.
I do hope your tank is over 100g, or that that goby is eating prepared food, or he may rapidly upset your rockwork with burrowing and then starve to death.
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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