Bichirs swimming weirdly then dying

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Another thing I forgot to mention is that both our bichirs keep on twitching, flipping upside down and moving or swimming in a U shape.
 
You said you have multiple bichirs do this? Unless they all hit their heads, it could be environmental.

All I know is when I purchased a group of young bichirs at an LFS, the owner netted them and put them in the bag and mine started twirling and spinning like your vid. The owner said not to worry and that they’ll stop as soon as he puts oxygen into the bag.

It didn’t make sense at the time, and still doesn’t, but it worked. Once he oxygenated the bag, they stopped twirling and they’re still alive today. Try increasing aeration
 
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