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Because the beneficial trace elements it provides gets depleted and it usually turns into a detritus trap - IMHO I wouldn't even consider putting Miracle Mud in a refugium anymore - it's an out-dated product and it's real benefits are questionable. If you really want a substrate for your refugium, try to get kitty litter clay, some would say it's the same thing as miracle mud but I would just grab rubble rock for a refugium and call it a day if i were gonna set up a tank.
I don't think it has to do with sponsorship, it just has to do with expectations. If you want to put in all the work maintaining it, then go for it. However, realize if you do not replace it annually it will become a detritus trap and it will raise your nitrates and phosphates. So you have to decide first if you want to deal with it. It is not a necessary thing to run a reef tank, so again a luxury if you want to use it.
I know folks have mixed reviews on the miracle mud but are there any folks around still using the stuff? I have been kicking around the idea for my next build so I wanted to see what their thoughts on it are.