[BGP Spook]

Can't see how you have your tubing run after it disapears between your hardrives.

What pump is that? Can't quite read the lable.

You could leave the top of your T-line open over night, or you could close it; shouldn't matter really.

To bleed your system properly, fill and close the T-line, and start doing aerobics with your case.(assuming everything is well secured) It doesn't need to be running while you turn it every which way.
The idea would be to give any traped air an escape route, so watch for it as you are turning your case at odd angles.(Note: Don't re-introduce air by inverting the case if at all possible.)
Once you have turned it around and gotten a good idea if there is any air traped or not, turn on the loop and listen. If you hear air traped in your loop then you need to try again. The sound is very distintive much different than the sound of rushing or gurgling water. It kind of sounds like tiny air bubbles are poping when there is air traped.

That is basically how I bleed mine loop.

Hope that was helpful.