I would leave 4 blank tiles in there which don't do anything, and have the fish swim around them? You don't know me very well, do you?
Also, the Japanese and German companies we deal with would be screaming for their versions to have everything that the American version had. And the Time and Crystal versions would have to be modified so that they don't print their information on the blank space where the crystal used to be.
I think AquaReal or SimAquarium have a mode like this. People can just buy that.
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