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Multiple C. nurii cultivars and C. affinis 'metallic red' have done well for me in sand-capped MTS at a low GH (~6 degrees). C. hudoroi and C. balansae not so much, but these are traditionally considered more 'hard water' species. Interestingly, Amano used C. balansae in innumerous scapes despite having very low hardness (never higher than 3 dGH). I suspect this may have to do with Aquasoil's cation-exchange capacity - though the minerals in the water would be low, it's possible that the substrate held enough mineral cations to supply the crypts.
 
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