[Jim Sachs]

The collision problem is the main reason there cannot be more fish in the tank at once. Other aquarium programs simply ignore the occasional pass-through, but for me anything which detracts so much from the realism is totally unacceptable. The new version will have the ability to add many more fish (plus invertabrates) because of the larger tank, but it will spread them out enough to (hopefully) eliminate pass-throughs.