I agree w/ Kula - tough plant.Any tips on getting tricolor to bloom?
I never even saw a stalk in the terrarium so I moved some to my east-facing windowsill with my flowering U. longifolia & praelonga. The plant put up five stalks and each has aborted multiple times (creating several forks in each stalk). Technically, two of the stalks haven't given up yet but I'm very doubtful that they'll succeed.
I was late in moving the U. tricolor from the tank to the windowsill so I've got some hope next spring may be better ...