I run the same system as "miracle mud" but using the "mineral" mud. I have been doing so for several years without any problems. My nitates and phosphates remain undetectable without a skimmer and coral growth and health seems good. When you run the system you must change out half the mud substrate on a yearly basis. If you go to the miracle mud website, they will send you free info and a DVD expaining the system.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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