Good for you for using a towel to cover the tank top.



30-40% humidity is too low if continuously that low. You want to raise that, and that can be tough to do with a screen top.



The 20L tank maybe too large for the little boa at the moment. Perhaps a 10gal is in order for the time being.



Re humidity, you have some options. One is to cover more of the top, nearly all. If that means you cannot use the heat lamp then get another heat pad. Use a dimmer to make one heat pad on somewhat, and the other heat pad can be on a separate dimmer on a higher setting. I recommend a thermostat for the heat pad on the higher setting.



Another option is to use a smaller cage like a small storage box or one of the small cages advertised in the classifieds.



What I would end up with in the end is a plastic cage with a small radiant heat panel. With that, you are set. There are a few cage mfgrs on the classifieds that offer that package all ready to go. Your boa is too small right now for a cage like that most likley, so a small storage box with heat pads is likley the easiest option until the snake grows up a little.
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Mark

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