I am placing 2 200 watt heaters, (just becuse i have them) in my 55 gallon FOWLR tank. I have a message posted here about my PH troubles, but once those are good, can the heaters be placed horizontally at the top of the aquarium on the back wall? As I finished building the aquascape with the rock i realized i forgot the heaters. Just wondering if leaving them at the top will create heating issues. I have 2 maxi-jet 1200's pushin the water around and will have a Magnum 250 running occasionally for polishing of the water, so im hoping the amount of water turn over will make up for the bad location. Will this be ok?