Placement of heater? - Aqueon Pro heater
I have this model for my 55 gallon tank
http://www.amazon.com/Aqueon-Heaters-Submersible-Aquarium-100-Watt/dp/B003C5TPF6/ref=sr_1_1?ie=UTF8&qid=1437133642&sr=8-1&keywords=aqueon+heater
I will be using an aquaclear(maybe two) to filter the tank.
Is horizontal, near the bottom, in the middle a good place?