Thanks, Here's a link to the Carp flybox... https://flytyerworld.com/#/FlyboxTiles/5cc351c1dd8617be200715ca
There's a species button when you click the flyboxes table... I'll add a catfish fly box.... and let you know... I caught a 15 to 20lb flathead stripping a black woolly bugger with 350 grain full sinking fly line. It was up here in Kansas city at the KAW. Also, I often catch channel cats when I'm stripping just about any type of bass fly that gets down there, also using fully sinking line. Oh yeah, usually you need to use a slow crawling type retrieve. they don't seem to aggressively chase food. Hope this helps. David