Are the plants getting lots of light in the fountains? You will need to mimic natural lighting for the plants inside and that probably entails a fluorescent light near the plants. And, also, what is in the fountain water, any chlorine or bleach? Plants will naturally decomp older leaves and pieces, so a filter on the pump might be a good thing. A charcoal filter will keep the smell out. I brought in my anarchis and hornwort and keep them in a fish tank that I turn on from 6:50 in the morning to around midnight when I go to bed. The hornwort slowly fell apart and died but the anarchis looks good still. It's probably been about 2 or 3 months inside.