I've recently caught the bug for these brilliant plants (pun intended) and found if you stick to the subtropical varieties, D.capesis etc, you don't need a terrarium, mine are thriving just in my grow rooms with humidity of around 50% and I've even got some outside the grow room where the humidity is 30-40% and they're doing great.
The larger D.capensis in the collection were all divisions from a single plant a few months ago and are pretty much all flowering, I'm gonna have 1000's of seeds. The smaller D.capensis are albi's and were divided up this week from a single plant as were the D.aliciae, which were much trickier to divide and separate the leaves, so aren't recovering quite as quick.
The Pitcher plant with the big wide traps looked like the smaller one a few months ago.
And the tiny VFT's were sewn a couple of months ago and sprouted 1 month ago, they've actually grown quite a lot, you need a magnifying glass to see the 1st trap.
They need plenty of light and I've noticed they prefer a blue 4000k light to a redder 3500k, but the main reason mine are doing so well is their food. They're getting all the fungus gnat they can take......lol, I also fed the pitcher and VFT a couple of live meal worms each, but that's since I bought them months ago. I wont be feeding the pitcher plants again till the gnat problem had gone, I also noticed a housefly in one of the traps, so it's feeding itself at the moment like the drosera. The vft on the the hand can't catch FGnat, so I'll keep giving them a meal worm occasionally.