"Should I install multiple return lines?
This is generally not necessary, and I will show you why.
If you inject a visible additive like an Alkalinity solution down at the intake of the return pump, you can observe just how quickly water mixes in a tank.
With adequate powerhead flow, all that water will mix together into a uniform haze in a few seconds with even low amounts of flow. This happens whether the the return is one outlet or many different ones. This is a good indication of why you need not worry about multiple outlets or placing an outlet as far away from the overflow as possible. Consider the following:
- Splitting the return can unnecessarily add to friction loss of the return system, lessening the output of the pump. In order to compensate for this, you would need multiple outlets – which are unsightly and provide no benefits
- Unless you have a 300+ gallon system or an 8′ long tank, there is no need to use more than a single return outlet
- A single return line is inconspicuous and easy to hide out of sight"
source:
GMACreef
@Katrina71
See i'm just being obtuse and unnecessary by doing all the dual return quad output crap in my tank...I'm like that ya know!