No CO2 yet, I haven't built a reactor. I dose 30ml of API Leaf Zone a week. The plec is 8.5", I'm afraid I'm going to have to trade him in soon because he's getting too big for the tank and my wife won't let me get a bigger one yet :( I've had the two ADF for a few weeks, haven't had any problems yet. They're getting frozen brine shrimp, that's what I used to feed them when I was a kid and had them. I'm working on more plants, I'd like to do a moss wall eventually. Any recommendations on what other low-tech plants to add?