I just re-read this thread - did you mean you have 200 goldfish? Or was that a typo? If so, I'm very curious how you caught a few guppies and mollies and, apparently at least one small hi-fin in a pond with 200 goldfish. I had a hard time catching guppies in a 40 gallon patio pond until I removed most of the water.
I also noted that you earlier commented that your pond would have no problem with a 2-3 foot long, 20 lb fish. I would disagree with that. At 1000 gallons you have a pond that's suitable for goldfish, not what is essentially a big catfish, unless that's the only fish you intend to keep in this pond. I mean, will it FIT? Sure. Will it thrive? Not so sure.