Hrm....I'll have to check next time they bite it. I'll have to admit, I haven't been too quick to study the effect when it happens because it's so eerie that I'll hurry to restart rather than look at it. We had an actual fish (given to us by our Sunday school class - argh!!) die on us a couple months back and it looked almost the same. The fish was motionless, eyes wide open (obviously), drifting slightly in the current.
I'll take a look next time and narrow down a bit better what's moving and what isn't.
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