120 gallon koi tank filter set up

[4Andrew2Moore0]

I have a 120 gallon tank with koi fish and others, And im thinking about putting
a sump in. But it's a glass tank so i need some of your opinions on what i should do? thanks heres a video of it


http://www.youtube.com/watch?v=vj7hOWnGhSc

 

[Ancient_Fish_Master]

you can buy an overflow or make an overflow with pvc if you dont plan on drilling the tnak.