Iowa Wild Caught Native Coldwater

I'm working on something I dreamed about as a kid:A local, native, wild caught and stocked tank. I'm starting with a 20g long as a test bed, and I am hoping to move on to a 55 gallon with what I have learned, as my stock grows larger.As near as I can tell, I am following the applicable laws -- local law, as I understand it, allows the catching and keeping of bait minnows, as long as you have the appropriate permits. There is no limit on how, or where you can keep them, just where you collect them, what you use to collect them, where you can use them live, and who can sell them.I started with .5 inches of Miracle Grow Organic (same as I use in my other tanks/jars).On top of this I layered .75 inches of mixed masonry sand/play sand -- it's what I had left over from another tank. Were I to start over, I would skip this layer.On top of this, I sprinkled 1/2 gallon of creek sand collected from an actively flowing section of creek. Originally, this was to seed the bacteria/critters into the other sand, but I *love* the look -- especially when you see the fish with it. I fully intend to add another gallon or so of sand in the near future.I filled with decholorinated water, as well as some murky creek water. Even though I was using cycled filters, I also added some SafeStart (living bacteria) to the play sand when I layered it.Into this tank, I added:~12 blunt-nose minnows from 1/2 inch to 3 inches long~5 bottom feeding darters (look like they might be Iowa Darters)1 Green Eared sunfish (~1.5 inches)I want to catch another sunfish or two -- these guys look and act a lot like Jack Dempseys. They also have polarized vision -- and this guy loves to watch everything going on outside the tank.I am planning on moving some of the blunt-nose minnows to the cycled 55 gallon to add room for more sunfish/diversity.I have several crayfish I would like to add. They are currently housed in the 55, and are not terribly agressive to each other -- and leave the blunt-noses alone. I do not have any darters in that tank. Since these are a natural bottom fish, there is some concern there.I am planning on getting some locally obtained water plants, and switching to a finnex planted+ for a 30 inch tank. I have already found wild Duckweed (how hard was that?), water onion, a variant of hairgrass, and hornwort. I will be finishing off the tank with some river rock (including limestone).Where I live is filled with limestone, and the water is naturally very hard, so this is not a huge issue.At this point, I am still researching what I have, and what it eats, before I plant too much -- easier to clean out the unwanted food this way.Full tank shot -- you can easily see the two different sands here. You can see some of the blunt-nose swimming, and the sunfish in the upper right.The blue thing is a nylon scrubbie from a cycled tank to add more bacteria space/some floating cover. The green is a cheesy fake plant.More scrubbies/lower angleMr. Sunfish watching me.I believe this is an Iowa Darter -- fast little bottom dweller. As you can see, their natural coloration is very much like the sand from where I caught them -- which is part of why I want to add more of it.Another shot of the dartersOne of the crays I caught. On /r/crayfish, it may have been identified as orconectes immunis -- but that is a loose ID at this time. I'd love to get a better ID.Attempted side shot of the sunfish. Between his habit of watching things going on around him, the still murky water, and the intentionally poor lighting (trying not to stress the fish too much) it's really hard to see just oh pretty he is.