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Marc from Marco rocks suggests using Emaco R400 and Acryl 60 in aquascaping, but I have been having trouble finding these products. Especially Emaco R400.
Any ideas where to source these, or the alternative you like to use?
After a quick Google search, it appears that Allied Building Supply carries it. Here is a list of their stores, maybe one is close to you. You can also try contacting places that sell slate or stone as they may have it as well.