Rose, just one question, wasn't your fiirst Betta in a bowl?
Have very DULL lives LOL
I was told at that time to use 1 tablespoon for 5 gallons which is what we are talking about here. I am not sure a lesser dose is something I would want to try on one of my little ones, but that is my experience. If someone else has had other luck then I would like to hear from them.