Minniw blowing bubbles?
 

I thought it was just the fish getting some air since he's in am experimental tank... but I swear my minnow is making bubbles at the surface of the water and under the plants of leaves just like my bettas! Ive never had experience with fish before, this little guy is a feeder fish that came from petco, and while his twofriends died of fish TB he seems to be fine (albeit lonely). is this normal behaviour? is this fish a "he"?
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there not bubble nesters . minows scater there eggs.