Press $ and shift and hold them and watch your money go up rapidly! But to make sure there's no pain in getting millions of money make sure you do it at the beginning of the game when you have no enclosures otherwise the tanks will get dirty!
The Marine Mania expansion is loaded with cheats! Open up the buy decorations popup and put a giant pacific clam in an aquarium, and it juggles it's pearl. The same goes for the treasure chest. Putting a scuba diver statue will be okay with the animals, but it doesn't do anything. BUT, if you put in a mermaid statue, it will break open into a REAL MERMAID! Its pretty cool, because other fish and animals will get along with it!
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