Join Date: May 2013
Location: Massachusetts, U.S.
I think you have an unfinished statement, but I am assuming your old Betta is gone now? If that's the case, you should be okay, I think. To be safe, I would rearrange the tank so it will be neutral ground for the Betta and Tetras, you can remove the tetras if you like beforehand, then put them back in the tank once its rearranged, then add the new Betta. After properly acclimating, of course. Just keep a close eye on them for a few days.
2 Boys: Benedict (VT), Ramses (King PK) 3 Girls: Gylfie, Sonata, Alice (all VT) 5 Cory Catfish: Sherlock, Watson, Mycroft, Howard, Gimpy