Midas and tail spot blenny

I recently got a midas blenny that was really thin and in a bad way. The only tank i had to fatten it up was a small 2ft. In this tank i already had an ecsenius ops which is pretty much the same as a tail spot.
For the first week they were fine together, no problem whatsoever but as the midas put on weight and became normal again, i noticed increasing aggression towards the little blenny. Whether this was due to the confines of the tank i don't know but there were more than enough hidey holes for them.
In the end the midas picked on the little blenny a bit too much. No damage was done, it was more like it was nudging it out the way. I was worried this would worsen, so i moved it to my display.

I think it might work in a 65 as they are different fish. the tail spot hangs around the rocks and the midas is more an open water swimmer, that has a retreat. So chances are they would keep out of each others way. The only downside is that due to the size of the midas, if it chose to pick a fight, there would be only one winner.
 
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