Seems like they all eat their fill, if food is still in the water column and they start to lose interest.
So some are fat and some are not. Even though they all eat.
Only thing I could think of is maybe some have internal worms/parasites?
I think prazipro works for that in the display tank. Research it though as I have never used it in the DT, just in the QT
And you are right in assuming they will do better with more feedings throughout the day, but smaller portions.
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