I have 2 150 watt Ebo Jager heaters in a 20 gallon sump for my 55 gallon aquarium. Unfortunately they are running 24/7 but are not heating my tank or sump. The only thing that I can think of is the water flow through my sump is to great for the heaters to heat anything efficiently. Any thoughts on a better location that I could put them? I was thinking about the refugium compartment of my sump since it has the lowest flow rate or perhaps even in the corner overflow? I have them set for 80° since I suspect the display tank will be a couple degrees less but my tank is running at 66.2°. I'm only a couple days off from adding my cleaning crew.