In my 6 x 2 x2 my spray bar comes in at one end and runs the length of the tank at the bottom.
this is behind and under my rock work and it pushes water slightly up and towards the front
I have anti syphon measures in place as I am running of a sump but not needed if you use canister.
I find that the gravel at the front gets the most detritus forming but that is where I want it so I can easily remove it
And as the water is movingup and torwards the overflows this is minimal anyway
If you heater is going in teh middle then you can put this lower in teh tank and you will also have more movement over teh heater making it more effective?
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