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Also, if you drill your return lower in the tank, it may help to stir up sediment that collect on the bottom and push it to your sump intake. You can also play with putting a dry fit 45 fitting inside the tank to redirect the flow of water.

Since your pump determines the GPH flow I would just drill the return for whatever is most convenient for the pump that your using. The main thing to look at for your return is the turbulence that will be created by your return. So the larger diameter PVC you use the less turbulence that will be...

So your going to drill it at the top to set your water level. I would go with a 1.5" bulk head to a 1" PVC. This will give you basically zero restriction. So your GPH will then be set by your return pump. I would buy a pond pump with like a 350+ GPH rating and dial it down as needed. Since your...

Yea it will effect the flow rate. I guess I need a bit more information. Are you using an over the tank siphon or are you going to drill through the tanks?

Very nice - quality job. What was your build cost?

On a drilled tank gravity feed on this with no other outside factors (air intake, head length, ect.) will yield in the neighborhood of 420 gph using sch 40 pvc.

I agree. I was actually making this statement in awe that they were able to get a patent that would make it unlawful for nature to occur :confused:

Here's a few photos of one I did awhile back. I used pink Styrofoam and expanding can foam with Drylok and concrete tint.

I can chime in on this one. I have been running a wet/dry sump on my tanks for 2 years with no issues. You do not want to use two pumps to run these systems as it is WAY too hard to synchronize the pumps and prevent the sump or the tank from over flowing. You need to use a siphon to pull water...

You know that it's a patent infringement to intentionally breed GloFish? License Notice