Sump plumbing

[outtafocus]

I will soon be drilling my tank. I need to know how to go about plumbing the line from my tank to the sump below.
Do I go straight from the bulkhead down into the sump? Will this cause the water to have too much velocity?
or Should I be have a 90degree bend or two in there some where?

Hmmm now Im think I may add a few extra holes to have the return line enter through the glass instead of over the top. Sounds much cleaner looking to me. Any suggestions where these return holes should be placed? 2 holes in an 18" cube.