HCA: Hermit Crab Association

My crabs do the same exact thing every day. One digs itself under ground for like 3 weeks. The on the other one sits one sits in the corner completely still and gets up for water every once and a while.

Is this ok or am I overreacting.
(They are both Alive )


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What is your temp and humidity?

I keep humidity at 80 and temp 75


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And they are both at the cooler side of the tank


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What species do you have?

Bumping the temp up closer to 80F may result in more activity. Many crabbers notice PPs are more active 80-85F. Es on the other hand need temps 80-90F or they become quite sluggish.

I have pp


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How could I heat up the tank more


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Because i can't get a bigger under heater


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Have you tried insulating your UTH? That is, if it's a brand that can safely be insulated.

No I have not


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Is there anything specific I should use


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As @CallaLily noted, only some brands of UTHs can be safely insulated. Ultratherms can be as can, I believe, Fluker's (@wodesorel would know the answer there as she uses/has used Fluker's UTHs). Brands such as ZooMed, National Geographic, All Living Things and pretty much all of the pet store generic brands cannot be insulated.

To insulate a UTH, you can cover the back of the pad with aluminum foil, then a sheet of cardboard and then styrofoam. That should give the tank a good 5 degree boost a minimum.

I have a zoo med UTH so I cannot insulate it


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There is cork board under the heater to stop the tank from leaving burn marks on the wood


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