I use the caribsea in my mangrove tank/refugium. I also cap it with about 1-2 inchs of sand. When I first started using it my nitrates went skyhigh. Im not sure if the mud caused the spike but nothing seemed to be bothered by it. Macros grow well in there and the mangroves need triming about once a month. I would use again for my mangroves but dont think I would use it in a sump or refugium without the trees. To hard to keep it out of the disply tank when attempting to clean the refugium.
Scott
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