Here's my wishlist. I think almost everything has been already mentioned, though.
  • Player's name showing on the main screen
  • Ditto for number of fish - perhaps split into babies and adult fish. The adults could also show whether they were pregnant or non-pregnant
  • More tanks - probably achievable only in the late stages of the game
  • Ability to decorate the tanks
  • A warning if you put the only specimen of a magic fish up for sale - I've lost a couple by mistaking them for a near relation
  • Make the customers more like those in VV/PT. They look very wooden and have a limited range of actions in comparison. There are also only a few different types.

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To err is human; to arr is pirate.