I don't have a final list of candidates for freshwater fish yet. You are right, I've tried to choose the saltwater fish population from those which would be reasonably compatible, but I can bend this rule a bit.
Here's the rule I have set: Creatures which would ordinarily not be kept together simply because of behavior will be allowed, and will only exhibit a mild form of their usual temperament (when I get around to programming species behavior). Creatures which would not survive in this tank because of physical conditions (temperature, size, salinity, etc.) will not be included.
At this time, I plan to allow cichlids and discus, but not goldfish or brackish water fish.
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