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I am just thinking if there is any benefit to running the filter return line lower to the bottom of the tank, then opposed to say 3-4 inches from the top?
 

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If you are using CO2 then the enriched water is closer to the plants and will have to travel further to get to the surface where it may be gassed off. You will be blowing debris off the plant leaves better.

On the other hand plant growth could block water movement and you do need some surface ripple.
 
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