Spraying is the only way I have ever watered plants in a vivarium. It sounds though, like your plants can be removed from the terrarium at any time since they are in a pot. That might be the better option for you if you have no way of dealing with accumulating water at the bottom of your terrarium. Does your terrarium have a drain or a way to pump the excess water out?
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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