Thats not so bad.....well,. Ok, it's kinda bad, but totally fixable!
There is another YouTube video where that PondMart guy has a pond just as green as this one,
http://www.youtube.com/watch?v=Adv2L7GACnQ and that guy just added a UV light to his filter and it started to clear the green away fast.
http://www.youtube.com/watch?v=ceZsL59b800
I have learned to trust Dr.Joe's point of view, and would just add that I have seen videos where a good UV light filter has really helped ponds that were a lot more green that this one is...
as for the money of a good UV light?...yes, thats nasty bite out of a paycheck to be sure.
But face the facts, while a green pond might not actually harm the fish, it sorta makes the pond a bit pointless to visit from a people point of view.
You took your time to make the pond, and it's a GREAT pond,,,except for the green water.
you owe it to yourself to get the pond in viewable shape too...