the importance of drilling your tank

[caferacermike]

And it didn't overflow like that when you tested it after setting it up? Or was it never tested?

The problem of having too strong a return pump will be an issue even if you had your tank drilled. Overflows, whether hang-on or drilled, can only handle so much water based on their size.

Cheers to that.

As well as RZA, I also have my return pump set up with a tee and a valve to create a recirculation loop in the pumps chamber. That way I can throttle back the return without worry of putting pressure on the pump.