Yes, neons do tend to become food for angels once the angels' mouths get big enough.
At this point I would advise keeping the fish in the "sick" tank in informal quarantine. If your larger tank has healthy fish and no problems, I would be loath to risk it by introducing an unknown infection. If you had data that your little tank problems were water quality I wouldn't hesitate, but since you don't know.. Well better safe than sorry. If you lose everything in the little tank, you can bleach it and start over.
|