Concerning the microBH:
These holes are of extremely small sizes, it is believed that their mass could be similar to that of the Planck.
Their mass is definitely way smaller than the Planck mass. It is instead expected to lie in the TeV range so that they could be produced at the LHC at CERN. As no micro black hole has ben observed so far, this puts constraints on the underlying theory.
Maybe would you mind fixing your post? :D
Done, thanks for your comment!