Miracle Mud - Any practical experience?

[inspector]

HI I have a 75gal bow front tank with a 30 gal sump c/w miracle mud .I don't have a skimmer just the sump with Calerpa and cheato , sump is full of life grows like mad. The system has been running for about 3 1/2 years only do water changes and all is good.I am not sure if its the miracle mud or not as supposed to change the 1/2 of the mud every 2 years I didn't and everything is still good.
Not sure if that helped I hope so there are lots of ways to do things just find whats best for you.
paul