That card might be considered in the "barely acceptable" category. Visually, the look of the aquarium doesn't degrade with a weaker card - it just slows down. If you are getting 30 frames per second with 3 fish, you might get 20 fps with 7 fish. (I haven't researched these numbers for your card.) Many people consider 20 fps to be perfectly reasonable, but the Forum fans are accustomed to frame rates of 60 or higher, so this is a tough crowd to please.
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