cookingnerd, when you say it didn't heat up your water much at all, does that mean that it is not effective? I am thinking about making one of these for a 55 gallon. How big is your tank and what heater do you have in this thing?
Eheim Pimp #254, Eheim Wolverine #1
Work in progress
10 Gallon Shrimp Tank
10 Gallon Planted QT
20 Gallon Shrimp Tank (Work in progress)