T Please dont take a fish from the wild, not only is it illegal in most of the u.s .But it is wrong. Go to the pet store and save a fish from its cramped habitat.
so it's ok to take fish from the wild in other countries, just not ours? while it is changing, the ratio for captive bred and wild caught in the pet trade still leans heavily towards wild caught. local fish can be kept if you learn what they need to thrive, which is what he's doing.
certainly not illegal here to keep local sunfish.
I don't know where bridgeportopia is, but as long as the temps don't get to low in the winter so it doesn't freeze, 16" should be ok for bluegill and sunfish. the size you give is about 300 gallons.
any plants should probably be in pots, a lot of sunfish, including (maybe even especially) bluegill, will mess with plants. the crayfish will definitely mess with the plants. the sunfish will mess with the crayfish when they shed, so they need hiding spaces.
actually, it sounds pretty cool, a couple big rocks sticking up out of the water to break up their lines of sight sounds cool to me. use the rock tops for some terrestrial plants, some lily pads and cattails in pots... too bad it gets too cold here for me to do it without a winter heater.
what are you thinking of using for filtration?