Water lettuce dying in terrarium
My husband is in the process of setting up a terrarium that will later also house frogs. It's a 29g tank that has half land and half water. There's probably not more than a couple gallons of water in there, about 4" deep.
Last week he added a couple of water lettuce to the tank. Within 24 hours a good portion of the roots had dropped off. I suggested that they might not be getting any nutrients, so he put a little bit of Flourish in there. He has since dosed once more with Flourish, but the water lettuce is all but dead now.
We were under the impression that water lettuce is not hard to grow and usually spreads like crazy. Why isn't it surviving in his terrarium? If we go out and buy more, will it suffer the same fate?