How can I lower humidity by 30%?

[LRRoberts0122]

I'm getting a new corn snake today.

I live in FLORIDA.

The humidity is outrageous. I had it at a consistent 68 - 70% before I put the water bowl in. Now that I've done that, the humidity has gone up to almost 80%.

This is WAY too much for a Corn Snake, and I don't want her to develop an R.I.

It's not a question of if, but when, at this rate.

I have a heat lamp, it does a little to help, but we're talking drastic changes in humidity, like 30% ~ not 5%, which is all the heat lamp does, give or take. Now that I've added the water bowl it's practically useless.

I have a fan that does literally nothing to help.

Can someone please tell me how to lower my humidity effectively, because I'm starting to panic! I don't want my corn snake to end up with an R.I. :'(