Pond/triploid carp?

[wags]

I've got an acre pond that's over run with weeds and moss. To those of you with experience how well will they eat the vegetation, and how many should I put in there?

I had a small pond that was almost completely covered with some sort of plant that grew from the bottom up. I put 6 grass carp in it and they ate like starving fools. They clear out the lake and then started eating cattails. They would bite them off at the water and chew them up. You could actually hear them. Putting in grass carp is definitely the way to go. They eat alot the first 5 years then they slow down but they are a one time investment. I paid ab out 9 dollars each about a year ago.