Just an FYI...I reinstalled the game and started over. I'm going to see what happens if I never buy the third level of advertising. I intend to buy all three levels of food and environment along with the second level of advertising though.

It'll take some time before I will know if that makes any difference, of course, especially since the 'pairs' of fish I got from the first two batches of inexpensive eggs are not high value pairs.

I think I will play for quite some time after completing the third level of food and environment before I purchase the second level of advertising. I have no problem waiting a while for them to sell.