I've been thinking of coming up with a plan to place my heater somewhere besides in my tank. Has anyone done this? I have a thing about having so many gadgets in my tank. There is just no way to hide everything. The heater is the biggest thing in there. Looking at some of the external reactors sort of gave me some ideas. My idea is to make some sort of a plexiglass box with an inlet and outlet and run it on my filter outflow line. The heater would be placed on the bottom panel of this box. If the inflow and outflow lines were above the heater then the heater would stay submerged even if the lines sucked air so the heater would never get exposed to air and crack this way. Maybe there is an easier way but I haven't thought of it yet. Any ideas on this?