Midas are funny with who they like in their tanks. It could work or the Midas could stress the others out in a major way. It all depends on the fishes personality. My Midas seems pretty easy going, gives the pleco a bit of a time but has never bit or tore him up. Just a little attitude toward him.
I am about two weeks out from setting up my 120g future home for my Midas. I will add some silver dollars with him then. This combo should work. I would love to add bichirs with my fish but the way he slurps down nightcrawlers, the bichirs would not have a chance!