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A cleaning and changing of substrate once things look dirty or too settled is my suggestion. May be a couple years or more. Tarantula enclosures are closed systems so it is different compared to out in the wild.
A lot of the most reputable sellers have online stores and Morph Market doesn't need to used to purchase from them. I only have one experience buying from a seller on Morph Market. One scorpion arrived dead and the other died from nematodes within 2 weeks. It was my worst ever experience buying...