All My Fish Are in the Wrong Tanks!!

[Purple]

UGH!

I have a 1 gallon with a female betta who is very energetic, and needs more room. I have a 3(?) gallon with male #1 who is old and doesn't move much. I have a 2.5 gallon with male #2 who can see himself in the sides and NEVER stops fighting with his reflection, and is now tail biting!!

My plan is to move the female into the 2.5 gallon tank so she'll have more room to swim and be merry. I'm going to move male #1 into her tank, the 1 gallon, since he doesn't need as much room, and I think that the smaller tank stays warmer. (I don't have a temperature problem, but old people like to me warm, so why not old fish?) I'm going to move male #2 into the 3 gallon since he's so energetic but he can't see himself in that one. (It's a bowl)

How does my plan sound? Also, how do I go about this? How do I make sure that the tanks don't keep any bacteria from the first fish? I have one cup for each of them, so that's not a problem. This is a bit off topic, but should I add aquarium salt to male #2's new water?

Edit: The only thing that they have in their tanks that won't be moving with them are heaters, thermometers, and a leaf hammock.

[Sena Hansler]

Never EVER add salt as an additive. It's dangerous to the fish's health. You only use it for medicating, and only if you know what it is you are medicating

The plan sounds good....

How do I make sure that the tanks don't keep any bacteria from the first fish

If the fish was new, clean it out with hot water. Rinse with luke warm. If all fish are fine, and you've had them for a while (I'd say 2-3 weeks minimal) there isn't anything dangerous to be passed around if you know your fish are healthy.