Humidity help

[Oliviet#1]

There are three crabs in my twenty gallon tank, and I can’t keep the humidity steady. I have 5-6 inches of substrate which is a mixture around 2/5 of eco earth and 3/5 of play sand. The house humidity is around 60% according to the acurite weather stations. They aren’t very accurate because they change too much and I even calibrated them. One was two or three percent off, and the other one was seven percent off. Even then the humidity gets too high and low. When I vent the lid it drops fast to the 70s. And when I cover and most it goes into the eighties and nineties. Please help.

[doth]

What kind of lid do you use? And how dry does the substrate feel when you touch it?

Larger water pools or adding bubblers to the pools can help.

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[Oliviet#1]

I use a a imagitarium lid with plastic wrap and a towel on top. I felt the substrate and it doesn’t feel dry but it doesn’t feel super wet either. The pools are and inch or less deep and only a 2-4 inches across.

[RiNiKy506]

Your tank is pretty new so your humidity will be high for awhile, it should balance out. High humidity will not hurt them.

[curlysister]

My humidity is always in the 80s and sometimes into the 90s. As stated, it won't hurt the crabs to have higher humidity.

[Oliviet#1]

I just don’t want to have mold growth, bacteria bloom, etc. should I just keep it covered and wait for it to drop down?