I've often wondered if you could set up a long shallow tank, put 4 or 5 inches of water in it with a powerful filter head at one end to simulate a fast running stream, with perhaps a deeper hole at each end......maybe a nano style with ferns and smaller native terrestrial plants along the back edge growing up out the top...............................heh, I'll stop dreaming now shall I?
Yep, temp is the hardest bit, I think winters are OK but things quickly turn to custard in summer time without a chiller of some description.
I think you're legally allowed to collect only certain breeds of native fish, common bullies and the like, some of the rarer ones you need a special license for,but yeah, Stella is your best bet.