If your tank is divided, they're sharing the same water on both sides so what you put in one side will affect the other as well. That is why it is best to quarantine fish when you buy them before putting them in their permanent home. So putting otos on one side and moving to the other doesn't matter that much.
"You are forever responsible for what you have tamed."
Betta love: it's an international thing.
Azure, Sterling, you will be with me forever. Peaches, my crazy girl, I'll miss you the most.
The Boys: Tranny, Inky "Yume" Zuko, Mao, Onishiki, Chopin, Maelstrom, Kabuki
The Girls: Kamikaze, Beeuty Qveen, Beefcake!, Chunkers, Awesome Sauce
Meeces: Koko, Bijli, Baadal, Barkha
Turtle: Hi Handsome (female -__-)