My son absolutely looooves this game and I have to admitt I'm a bit addicted also. But we have run into a slight problem. We were selling fish for around $30, and recently I can't sell the same fish for $10, I'm level 2 for advirtising so I'm not sure what's wrong. And also how do I find breeds that are worth more and how do I know what they are worth? Fish are now dying from disease because we can't buy the meds and my son is becoming quite upset about it....if you have any advice it would be greatly appreciated...
thanks

One thing that makes fish sell much faster is to make sure that your selling tank is very full of fishies before you click the Sell button. The more fish you have, the more customers there will be, and the faster you will sell. You don't say what level of Fish Environment you have, but there are several fish that will remain healthy in even a level one environment and bring prices as high as $65 or more. One of those is the first Magic Fish, which you can get from common eggs. The suggested price that the game provides for a fish is usually a good starting point, although you can usually sell the fish for more. It's a trial-and-error process to determine what the maximum asking price for a particular species actually is.

If you'd like some spoiler kind of help, just send me a PM and I'd be happy to provide you with specific "recipes" for some good fishies!

its hard to say what the max price for each fish is. The best thing i found to do was either breed magic fish and sell them for money or breed orange fruit fish. i think sell for around 20$ a piece. Get a tank full of those and you can do some good. But research is key to survival. Until you can breed more exotics, there isnt much you can do from my experience. Try to get yourself two magic fish of fertility and sell them at higher prices and you can make some money. If you want to know how to get it just ask, didnt want to spoil it in case you didnt want to know the secret to getting them

no i deffinately would like to know how....i can deal with it being spoile haha...thanks for your help!

well, you cant try to get a breed called speckled leaffish and sell it for $70, and keep on breeding it if you can get two. Breed it until you can get a tankfull of them. This way you can get like over $900, per tankfull.