This is where you discuss the conditions of your crabitat -- temperature, humidity, substrate, decorating, etc.
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Unless there’s an issue with your substrate (bacterial bloom, flood, infestation of harmful insects) you don’t need to change it out. Ensure it’s the right depth and consistency, spot clean any large pieces of food waste you see dragged out of the food bowl, and top up the quantity as needed. But no need to change it out.
Yep, as GG said, no need to change except in emergency circumstances. Most of us use a mix of EE and play sand - it holds it's shape well, helps with humidity, and cheaper than just EE. Straight EE has been known to be a bit more problematic . In the 9+ years I have had my crabs, I have never changed out the sub completely. I have just added more as they have grown and as I have upgraded tanks.
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