Hi Jay,
The note about the "8th Fish Widescreen Only" explains that the last slot is only used in widescreen mode. It doesn't become a fish slot if you have a widescreen, because then it would be the 9th fish. This UI has caused a few people to be confused, and will probably be changed in upcoming releases if anyone can suggest a better way.
This was just described on a thread
http://feldoncentral.com/forums/show...?threadid=2718
You may want to try entering wireframe mode (the 'w' key) and counting how many fish are in your aquarium.
Jim Sachs, the artist and original author of Marine Aquarium, decided that with more than 7 fish in a 4:3 tank and more than 8 fish in a 16:10 tank the fish spent too much time running into each other and the behavior was unnatural.
Thank you for your post.