This substrate absorbs water very quickly. Put the brick in a large bowl and fill the bowl half way. Once all the water is sucked up, break down the brick as much as you can. If you confirm all the substrate is moist process complete. If more water is needed, add another cup or two of water until all is moist. There is no specific measurement and each brick is a little different in size and may need more or less water. Make sure you use dechlorinated water for this process or you can kill your hermit crabs!
Cleaning the substrate is very easy! Your hermit crab feces will actually decompose into the substrate which makes cleaning a lot easier. Just spot check the soil for any buried food and remove that portion. Every two weeks take out the top 1 inch of substrate and replace it with fresh substrate. Every three months, replace all substrate in the tank and give everything a good boil, scrub down or bake. (Not your Hermit Crabs, but their toys, branches, un-used shells, and bowls)
Remember never use soap when scrubbing bowls and always use dechlorinated water. If needed, use vinegar to help the cleaning process but make sure to completely rinse away all vinegar with dechlorinated water.
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answered 1 year, 2 months ago
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For hermit crabs, it's a good idea to mix coconut fiber and sand together as a substrate (5 parts sand, 1 part coconut fiber), along with salt water (make the water using aquarium salt, like Instant Ocean.) The mixture should be sand castle consistency, and the depth should be 3-4 times the size of your largest crab's shell. You don't want to use coconut fiber alone because it won't provide adequate protection when they molt. Using salt water in the mixture will hinder bacteria and fungus growth. Sand castle consistency is important so that they can tunnel without it collapsing in on them.
You can clean it just by scraping off the top layer. Make sure you replace some of the sand now and then to maintain the depth.
You can find more information by googling "hermit crab substrate."
answered 3 years, 11 months ago
7out of 8found this answer helpful.