I am approaching the 2week mark for a 70gal FOWLR
setup and I am using the Ecosystem Pro60.
Per my own searching on this forum, local fish store advice and other Internet research; I decided *not* to use the miracle mud. The general consensus was people saw no real benefit of the miracle mud and if they had to do it over they would not use it.
FWIW, I am using "plain" argonite substrate in the refugium with about 2lbs of very branch-like live rock and various macro algae on a reverse lighting schedule.