hmmm...and only the ones gasping for air? hmm a mystery...

well, i do know that they are very moody fish, and may take a while to
adapt to a new tank or tank mate.

has the one always been acting listless, while the other one is fine?
and you say the tank if fully cycled...

maybe try to find a different food, other than the feeders to give
them, and see if that peeks the one up. speaking of eating, hows his
appetite?
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