I would predict you wouldn't have any problems with that. Generally gobies and blenny's are pretty docile fish and don't generally become agressive towards other fish unless the conditions are crowded or they are similar species.
Not all blennies would be safe. Lawnmowers for instance can be very aggressive. Most gobies would be okay. If you can find one that eats prepared food or have a tank and refugium that can sustain one a mandarin is a great choice. I have a spotted Mandarin with my erectus pair and they eat right beside each other.
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