It's really nice, but how do you get money? The money limit seems pretty small, so placing a few things means it's all gone, and the fish are the most expensive. I saw it go up once which was only 1 dollar and is barely anything. A really good concept of a game that only needs some extra stuff like sound effects, and maybe the mater actively a little more dynamic with things being placed in it.
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You get money dependent on the number of plants and animals in the tank. Having more animals means you get a lot more money. I suggest the general strategy to be to place six seaweed (50 money each) and four anchorfish (also 50 money each). You can also speed the game up by holding A, and slow it down by holding S. The higher speed naturally accrues money faster. With the setup I mentioned, you will make a ton of money really fast because the fish and plants will sustain reproduction for a long time without collapsing.
If at any time you're tired of the fish/plants in the tank there is a reset cheat so that you can start over with all the money you earned. All you have to do is type 'thanks' to kill all the animals, and 'rings' to eliminate the plants and food in the tank. You will keep your money and can make anything you want.
Thank you for playing!