I had all but the seahorse in my games and have little or no sickness. maybe it's a fluke I don't know but I'm calling for everyone to do the same thing I did and keep track of how many sick fish you actually get. In the game without the seahorse in it. only 2 fish were sick and I was playing it on hard. in the game with the seahorse in it I had 20 sick fish. go figure... I will do more games with the seahorse and without it. but I'm pretty sure the results will be the same.
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Don't Buy the seahorse for fish tycoon. It's main job is to cause sickness upon your fish. See my post.