If I were you, I would set it up so it's semi-self sustaining.. Minimal effort is the way to go. I'd set up the water portion with a bunch of goldfish or something similar so it can be used as a food source for the CWD. I'd also put some aquatic plants in the water so the fish can feed on that if they want. I think the idea of a some what self sustained mini ecosystem is cooler than any fish you could put in the water. Just my opinion anyway.