So I have had bettas for about 4 months now so I'm still new. About a week and a half ago I added a second betta to my soon to be hoard. While waiting for my divider to come in I hady new betta in the 10 that was going to be divided and my older one in a 1 gallon bowl for fin tears due ro my lack of knowledge. Earlier today I put both fish in the newly divided tank while the older one is fine and feisty as ever flaring at his shadow like he does. The new one has now started to swim on his side for no reason. Could it be from the stress of having the oyher fish there?