I have had to resize my sump due to space contraints. The new size is 15 gallons, vs the 20 gallon original. From a size standpoint, the only difference is the new one is 4 inches shorter than the old (length and width are the same). I have a few questions though:
1. How far down into the sump should the drainpipes extend? Obviously they need to be below the waterline, but how far below?
2. How do I set the waterline? Is it based on the drain pipe depth, flow rate of the return (a Sicce Silent 3.0, with approx 4ft head), baffles, etc?
(I know I need to leave enough room in the sump to handle the volume of water in the overflow box plus the pipe.)
WRT the return line, I'm going to run that up and over the lip and down into the tank. I'm guessing I should drill a small hole in the top of the line under the waterline to act as a siphon break in case my return pump fails, correct? How big is a "small" hole (I'm thinking 1/8 inch or less).
I'm using the BeanAnimal overflow, hence the 3 drainpipes. See the attached for progress pics: