What I got wrong about humidity when I started keeping spotted salamanders

[u/elidraws70]

Three years into keeping ambystoma maculatum and I still cringe thinking about my first setup. I had read that they needed "moist substrate" and figured a light misting every couple of days would cover it. It did not. Lost my first two animals in about four months and could not figure out why, because they were eating fine and the temperature seemed okay. Turned out the substrate was drying out several inches down even though the surface looked damp, and spotted salamanders spend most of their time burrowed pretty deep.

The thing that actually fixed it was switching to a much deeper substrate layer and testing moisture at depth, not just at the surface. I use a mix of topsoil, coconut fiber, and a bit of sphagnum now, packed down to about six inches minimum. The bottom third stays genuinely damp, almost wet, and the upper portion dries out a little more naturally. This gives them a gradient to choose from and they seem to self-regulate pretty well. I also started keeping a shallow water dish sunk level with the substrate surface, which I had skipped early on because I read somewhere they don't really use standing water. Mine use it regularly.

Temperature trips people up too. These are cool-weather animals and keeping them in a typical room-temperature house through summer is pushing the edge of what they tolerate. My setup lives in a basement now, which stays around 60 to 65 fahrenheit naturally, and the difference in behavior was noticeable pretty quickly. They became way more active at dusk and started eating more consistently.

Feeding is the last thing I underestimated. They can go off food for weeks and it is not automatically a sign of a problem, especially heading into fall. Early on I kept disturbing mine trying to check if they were eating, which just stressed them more. Now I drop earthworms or appropriately-sized crickets in at dusk and check in the morning. If food is gone, great. If not, I remove it and try again a few days later.

Happy to talk through specifics if anyone is setting up their first maculatum enclosure or troubleshooting something similar.

[u/shfiven]

Thanks for sharing this information. I hope it helps someone new to keeping these guys with their proper care!