some LFS sell disks I do not which ones I just make my own use low alkali cement and either argonite or coral sand throw some crushed coral in also if you want to give it some lumpiness cure them for a couple of weeks or months in fresh tapwater I use the waste water from my RODI they will have a high PH for a few months but as long as you do not use too many at once the PH of your system should be fine.
Borrowed a table saw from a buddy that had a diamond blade on it. The blade is made to cut much denser material like marble and porcelain so it was very easy to cut the rock.
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