[ChuckG]

Nice set up.

Hmmm.... I thought my diagram was pretty good. I do realize I'll end up putting in unions, ball valves (which it doesn't look like you did), etc which will all take up space as well. My diagram was as simple as I could do it to show the concept.

Imagine it this way: Set an aquarium on the floor. Set a pump on the floor behind the aquarium. Plumb the 4 way on top of the pump using very little pipe. I'm guessing this would put the outlets of the 4 way about halfway up the back of the tank. Now simply imaging plumbing those outlets to where my "drilled back" holes are in my diagram. The pump would obviously not be able to set directly behind the tank. I will need room to make the appropriate angles, etc. and so the ledge it sets on may have to be about a foot or so.

Maybe this will help you imagine it. This would be a view looking down on things.