How to make a sump...

[Pharaoh]

Well, you could always try and drill the tank on the bottom. Then you could run all the plumbing you want underneath.

 

[Eric A]

I can't see why you can't use an over flow box.

 

[SalmonAfrica]

I've just done some re-arranging, and it looks like I have some free space Sorry that I still haven't got the pics up though...

Anyways, I think I'll go with the idea of the overflow-box and the drilled bottom, it seems a bit more practical. Thanks for the pics there Eric

 

[Pharaoh]

Good choice!