My refugium has a layer of caribsea mineral mud.I can't say anything bad I do have a thin layer of aragonite over it,My fuge has a large population of amphipods and other small creatures,It also grows lots of macro.My display has been running for 7years and the fuge 3.5 years and no problems.I can't say anything bad or good about the mud because it's been in the fuge since day one and I have nothing to compare to I can only say everything works.My fuge is a little unique but my technicals isn't what your question was so I won't ramble hope it helps. I've also seen may mag photos of systems running eco miracle mud,expensive stuff.If it's expensive it must work???????
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