Grumpus - You'll like them. Those stalks look exactly the U. subulata I had in my pots. I managed to separate them out during several repottings. I don't think they're THAT bomb-proof. You can basically kill any cp (except pings, etc) by letting them dry out excessively.
But you wouldn't want to do that to your lovely bladderwort....
Although they did not make flowers for you this time around, try sowing their seed. Then you might just get a clone that actually puts out flowers instead of just seed pods.
Warm temps and high water levels along with fresh seed increase your germination rates.