This is the overflow pipe draining water into the sump. I used 1" pvc with a Tee fitting. With the piping outputs in the middle of the tank, I think I'll get the better circulation.

Here, the water level is right up to where I want it to be. It should be just out of reach for the snails..... and if snails do find there way up the pipe it won't cause any trouble.

The tank is 26" high. The gravel is 3" thick and there is 10" of water above the gravel. Minus the gravel, there is 75 gallons of water in the tank.

The return pump goes to the UV Sterilizer. It 's a Rio pump that's rated for 650 gph. There is a shut-off valve near the end of the return line so that I can control the flow rate. I have it set at about 300 gph. If I set it any higher right now, it will overflow my main tanks. I'll need to get some 3/4" tubing for the overflow intakes if I want to increase the flow rate.

Here's the shut-off valve for the return pump and above it is the external overflow.

The return hose goes to a spraybar in the rivertank. The spraybar has a hole above the water line to act as a siphon break, just in case if the power goes out.

Here's a pic of clowns going at some cucumber.
