Leak Frog is another good water alarm. You can get them from Woot.com for super cheap every once in a while.

Rob,
The boards will dry but you may have some mildew. Aim a fan at the base of the tank and let it run for a few days. The fllor is already wet so spraying mildew killer (bleach and water) on it won't hurt much other than maybe a little more discoloration of the wood. Just keep it out of your sump!

Jack