OK so this game took a while for me to like it. I actually put it away for a few months but when I went back to it and re played it I am really enjoying it now.
Sure, it does take a while before you get any fun out of it. You need to know the right way to play it to actually enjoy it.
At first you can only breed the same fish (same species) if you mix species at first they wont survive. What you need to do is breed fish constantly and sell them, you need to breed enough to fill both the tank 1 and sale tank so thats 40 fish on the go all the time. You need to save up money to buy all 3 reasearch tank levels before you can start experimenting with mixing breeds and coming up with new fish species which is when you can make your money.
Fun game when you get into it with hours of gameplay :)