I would love to be able to buy additional tanks and actually GET all 441 fish swimming around at once! Having 20/21 limit per tank and only three tanks means you have to start selling off fish you might need to breed in a later generation. Maybe only three tanks until you get all seven magic fish, then you can buy more?

I would also like a fish tracker, but I printed out my own and just use a pencil to mark them as I get them. I know I've missed some, but it's sortof fun to see how many different fish I can get.