I am doing something similar. I have a 300 gallon pond and I'm working on adding the second phase of it, which will be another 5500 gallons roughly connected by a stream. I love catfish and I'm trying to raise all the species of my state from babies. As of now I have a yellow bullhead, a flathead, a channel, and an albino channel in a 40 breeder. They are all less than 4" and they all hate each other already. I'm starting to wonder if my idea is going to work even if I have 5500 gallons for the larger species. I see guys post videos on here of blue, channel, and flathead cats coexisting in aquariums so that gives me some hope, but I'm not holding my breath.
As far as catching them, I don't collect often, but I managed to get two flatheads and a channel from a nearby river. They were all 3" or less at the time and I found more, but didn't catch them. I found them all just by turning over rocks. if you're looking for 6-8" guys i would probably try evening cast netting or rod and reel with smaller gear and bait.
Unfortunately I think the other guys are right. It will be hard to get them to coexist in such a small area and the blue would certainly outgrow it.
If you want to go the channel cat route you can find albinos for sale pretty regularly at fish stores. My local guy had no trouble ordering them for me. Bullheads are also a nice idea. I have a few in my 300 gallon pond that I raised from .75" and are currently 3-5". They get along well and it's really a lot of fun to feed them. If you hold a handful of food in the water they swarm and eat right from it.
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