New sump with DIY PVC overflow pictures

[Glennrf38]

Got the 20 G sump going for the 29G tank. The DIY PVC overflow seems to be working great (see pictures). I have turned it on and off probably 20 times so far and not one problem.
Every 2 or 3 minutes I get a big gurgle, but I think installing a air check valve should cure it. The only problem I have with it is when I completely empty the overflow, it is hard to get started again. Once it is started it runs fine. Any ideas on the hard start?
Tanks seems to be coming back to life after the heat wave crash of 06


Back of the tank and sump

DIY PVC overflow


Glenn