I'll try to describe it a little better...
MacOS X 10.2.4, G4 Cube, 450 Mhz.
No bubble column or sound, full shimmer.
It's happening in front of all the coral.
All 7 fish are on, random selection
When one of the new bigger fish comes head to head with a smaller fish, the big fish stops and the smaller fish 'bounces' back and forth and 'slides' up or down until it turns a little bit and they swim past each other.
Also, occassionally, one of the fish will 'slide' up or down without equivalent fin movement. This usually occurs near the top and back of the tank.
BTW: Thanks for the great (and fast) replies. Never expected them based on experience in other forums. Kudos to all of you!!
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