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Canecorsonewt 12:13 9th November 2016
Substrate might help with cycling, might be easier to grow bacteria on then glass just my guess. If you do decide to use sand now be a great time to put in new tank, it can make water cloudy for a few days even with a few full water changes.

I would Not put substrate in tank your axolotl in know, just leave cycling tank with axolotl be in till it cycles, besides doing water changes.