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This has been covered many times, but here it is again -
There are 3 reasons for the 7 fish limit.
1. Realism. A real tank of this size could not support any more fish. Even 7 is actually too many.
2. Visual. More than 7 simply looks overcrowded.
3. Technical. The collision-avoidance routines have a very hard time keeping more than 6 fish from passing through each other. Even 7 is really pushing it.
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