I agree falling in would be a bad thaing. I have notched out the ends the one set of fans should be going perpendicualr to the sump not on an angle, I was just a little lazy there. With the PVC being notched they can not fall in.
Dan
For what it is worth this is how I cool my tank when the weather gets warmer. The setup for 2 fans cost aprox. $20.00 if any one is interested in the details just drop me a e-mail.
Dan
The algea Valonia (bubble algea) is a macro algea so having good water does not mean that it won't curse your tank. Take your rocks out of your tank when you can and scrap them off while in a bucket of saltwater. If you have to remove them while in the tank use tweezers and have someone keep a...