You got hosed. The HBG will spawn somewhat but are not what you need. I can only assume that the hatchery guy was better at selling fish than stocking for a balanced pond. The BG and CNBG spawn multiple times in the South to create the sustained forage base needed to feed larger predators.
OK, I don't think all is lost. I would get some 2 to 4 inch CNBG or BG, maybe 1,000, and add to the mix. Some will spawn true and some will cross to create a Green Sunfish. Some consider the green sunfish an undesirable fish. Neither I nor the bass agree with that. Wait about 3 months and add some 3 to 6 inch bass. You can add the catfish now. Along the way, you should have a lot of fun with the HBG and get a lot of fish dinners.
The alternative is to rotenone the whole thing and start over.
More than likely, in either case, you will want at least one feeder. I know that may not meet your idea of a self sustaining, balanced pond. However, ponds are seldom, over time, either balanced or self sustaining.
Did you check your water quality, PH and alkilinity, prior to stocking?
BTW, I would do my fish buying elsewhere in the future. That guy does not have your best interest at heart or is ignorant.
