Maybe in this cas and additional qualifier should be tank size. A larger tank maybe be better for the aggression factor with the bicolor. Also perhaps more aggressive tankmates keep it in line. I just know that there have been a number of folks on here that have had bicolors and have regretted it.
On the Midas, just my opinons as I had a canary, same kind of open water swimmer as a midas, and just not the character that the tailspot, or bicolor or any of the rockdwellers have. Have had an algae blenny too and while it did have the character got aggressive as it got bigger and had to go. So there are my opinions, and experiences with those blennies.