I have 3 tanks set up, and 5 bettas.
3gal with 1 betta
5gal with 2 bettas
10gal with 2 bettas
I need to switch most of them into different tanks, to give them the best home. For instance, my biggest males need to go in the 10 gallon and so on. All of the tanks will be cycled when this move happens. So at one time, I will have 4 males in cups acclimating them to their new water. When I do this, I use a turkey baster to change 25% of their cup water with their new tank water every 15 minutes. Is this the best way? I know that once they get in their new tanks, they will need time to settle, so I'll keep the lights off.