*** sollution found (maybe)! ***
I had the function "Force W buffering" enabled. I turned it off, filled the aquarium with Lionfishes and now they seem to stay in their own skin.
*** ----------------------------***
System is:
Windows XP Pro
Proc. 1.4Ghz AMD
Gfx: Hercules 3D Prohpet 4500 TV out
And I agree with Feldon...
Don't bother about this versions bugs Jim (if it now was a bug), just continue working on the bigger 3d-world!
Can't wait!