In article .com,
wrote:
Some will say you can add fert balls to the substrate but you forget,
plants show preference for the water column given a chocie between
substrate of water column in a number of controlled test.

Yeah, I had some crypts stuck in a tank I'd forgot about. Tank
was bare - no gravel and these five crypts just sat there for
three months with a lead weight wrapped arond them. They grew
like crazy. I had a real hard time tearing them apart.

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