A midas blenny is compatible with any jawfish. The midas blenny stay at the rockwork and top of the tank. A jawfish will stay at the bottom, near it's burrow in the sand.
The only foreseeable issue is that BSJ are from cooler waters than most keep their tanks. Warmer temps = shorter lifespan.
Thanks, I have heard of many successful SPS tanks running at cooler temps (76F) and I have also heard of blue spotted jawfish also doing well in this range. Spot feeding is what I hear is key with these fish also.
I was more concerned with the Midas being aggressive with fish the same color/size since he BSJ is quite similar in both.
Thanks for your help!