Put all fish at 800$+ and people will buy them. Then buy 5 fish eggs and hatch them but also buy 6 drops of fish hormones. Then when our sale tank is full keep the in tank 1 and You will keep getting 800$+.
Money Code using Hex Editor Neo
You have to download the Hex Editor(it's free) and once you run the program you have to find the Fish Tycoon game where ever it is saved at on your computer. You should see "FishSaveGame1" or something along those lines. Select and open the file. Scroll down to 000003a0 and click in the fist numbers or letters that are there to the right of 000003a0 (if you look straight up under the file name of the saved game it should say 00) click that and type in 9f and do that for the first 3 boxes. Save the info and you should receive a popup box warning that if you save it will clear all change history. click YES to this!!! it will not affect your fish...just ur money! Once it is saved just close it out and run Fish Tycoon and do the same thing for other saved games on there but you will have to select the actual numberd slot the game is in.
Grow fish really fast
If u don't want to wait for fish to grow just go to ur clock and change the date by a day or few and your fish will be fully grown then you can put the date back. Great for getting money fast!
Drag your fish into the box at the bottom of the tank then click on species change the price to 0 then keep clicking on the 9 until it gets to infinity.