One more thought. If you really love catfish --
do you have room for a second small pond?
That's exactly what I did. My lowest pond...the ones that all the other ponds drain into...is stocked with 90% albino catfish. I am sure a few other fish have come thru the upper pond drain pipe with the recent rains, but it remains pretty much an albino catfish only pond. I have put some bluegill in there too. I don't feed them so I guess it's been a free-for-all of who survives and who doesn't.