From my experience growing carnivorous plants many would not do well in a riparium. They are extremely prone to root burn from their soil having too much nitrogen. That's why they became carnivorous in the first place. The bogs and swamps they come from have very nutrient poor mediums.
I agree with this general idea. If you were to try to keep carnivorous plants with fish you would want to use a very light bio-load.
Many carnivorous plants also generally prefer to be outdoors with bright and very airy conditions and they suffer if you keep them for very long indoors.
Carnivorous plants also tend to have limited foliage--they don't need much leaf area for photosynthesis--so it would also be hard to get them to fill in and cover up the riparium planters.