For reference, I live in one of the wettest areas to grow. I use a GE dehumidifer which is not only expensive, but powerful. Don't put a bigger fan in there aimed at your plants, it might toughen them up but it might hurt their leaves. My home goes up to 80-90% humidity and it brings us to about 30-40 percent in under an hour. I think that in a space like that when you bud you might want a dehumidifier to control your humidity, but if you live in a dry area you can probably do just a small fan. (edit: I just made so many edits to try to make this post clearer, lol.)