I haven't had fish in a long time, but when I did, I always used RO water. right now, I am planning on setting up a 1 gallon tank on my desk at work. We are lucky enough to have an RO unit for filtration here at work.
I always just used Kent RO Right to treat my water when I had a community and planted tank. I am wondering if there is a RO treatment product specially formulated for a betta tank? Thanks!