I put a modified Coopers IPA on last night & it's fermenting like a mad thing at the moment. There's a steady stream of foam creeping out of the hole where the airlock goes on the fermenting bin.

Any ideas what the best course of action is? Just let it run it's course, or take the lid off until the foam dies down?
It's in a 20degC room now. I could move it somewhere cooler.
Cheers!
FF