Don't freak, I haven't done this, but I am wondering what the real negatives are if you do rotate your Betta's between tanks. I would think stress would be obvious, however it may not be as big a deal as I think. Do any of you have experience with this? I have two in 5 gal tanks and two in 3 gal totes. It would be nice to let them switch from big to small occasionally for a change of scenery. Just a thought. Disease could be another concern, and their territoriality.
I will not do this unless some of you have had positive experience with it. Instinct tells me "No"..but I am asking, politely, for opinions.