Baby Steps

[jgoldsney]

For a Custom Tank if you can provide very detailed drawings Aquagiant makes a nice product...Just make sure that your drawings are very detailed.

[mark]

Not sure of your planning but hope the mid level returns are for a CL, (dangerous for a sump, unless it's huge).

Also if having a CL might want to consider some flow from the front bottom.

Eitherway, drill lots of holes.