Nepenthes pitcher plants are the best candidates for an enclosed terrarium setup. The biggest problem with terraria is the hunidity, which could easily lead to mold. The next disadvantage of terraria is that it doesn't provide for the plants that require a change of seasons, particularly with regard to colder temperatures. AFAIK, all Mexican & SE American sundews require a change in seasons. Most terrestrial bladderworts should do well in a terrarium, such as U. livida, sandersonni, and bisquamata.

Yes but nepenthes would become to large for this tank very quickly. And what about butterworts.

i know this is probably not what you are going to do, but those plants you have are perfect for dart frogs. two would be a great number for your size of tank. they are not poisonous in captivity, they have a mutualistic relationship with any good terrarium plant (especialy carnivourous and bromiliads), most are extremely easy to take care of (depending on species.) and all are just plain beutiful. for this you will want a terrestrial frog for starters (d. azures- blue with black spots) or (d. auratus) black or brown with blue or green wavy ring like markings)
sorry to ramble on i am not an expert on carnivourous plants (but i do have some of my own) i just thought that you might like to hear about that. they do help with the fertilization and care of the soil and plants though... :)

Sounds interesting but I doubt I could do it.