Get the tub off the floor and move the fan.

Fans are great to keep the humidity down a bit and keep the air fresh but you do not need to point the fan at the tub. Having the fan across the room usually works just fine. If the fan is oscillating that makes it even easier. That's what I use in the corner of my snake room. I have a standing oscillating fan on med 24/7. Keeps my humidity from spiking and keeps the air in my cages from being stagnant.