
Had a think. I use an aquarium tank that came with a submersible thermostatic heater. Searched cupboards, found heater. Found a suitable bottle and carried out measurements and test. Siliconed bottle top,let set. Then cut base off bottom of bottle. Inserted heater, turned on full (outside of bottle doesn't go above 75f). Buried bottle 3/4 into substrate,filled empty space with de-chlorinated water. Crabitat now at 83% hum, and 74f temp. Bingo! Will do as a quick fix. Kept bottle smooth so crabs cannot climb sides. Checked surrounding substrate and all is well


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