It's finally done Now just waiting to get the holes drilled in the glass top to install the Rainmaker. Should be done tomorrow. I'm gonna let it run for the week, then if all timers work out the frogs go in this weekend.
Most people use GE Silicone II. You can find it at any hardware store for around $5 a tube. It says that it's not safe for aquariums on the tube, but don't worry, many people have used it without any problems.