Re: Mosquito Dunks okay to use in their water?
There should be no problem with BT in a fountain.
Bti [Bacillus Thuringiensis subspecies israelensis]
has not been reported to affect a large number of other invertebrate species including most aquatic fauna. It is not toxic to bees. Fish are not affected, either in the laboratory or after field application.
--- Victor Hugo - "Common sense is in spite of, not the result of, education.”