Me too! I've always wanted to do a tank like this, but steered away due to the daily maintenance (misting) and food requirements for inhabitants (fruit flies). Now that it's automated, I'm seriously considering it!
I have only done a tiny amount of reading on these plants, but I'm under the impression they can get by on just photosynthesis. I still have a lot of questions though. For example, Venus Fly Traps can under no circumstances be fertilized. So where do they get their nutrients?
"Like other plants, Venus' Flytraps gather nutrients from gases in the air and nutrients in the soil. However, they live in poor soil and are healthier if they get nutrients from insects. Carnivorous plants live all over the world but the Venus Flytrap is native to select boggy areas in North and South Carolina."