First of all, i would like to say that it is a shame, the aquarium doesn't get any major updates or fish extension packs or the 3D background. It's been almost 2 years now and nothing has happend after the update with the lionfish. It has become a true commercial product like all other software s..t
I understand you need to devellop more software products to be allowed in software shops etc...
Your opponents come very near, ex. Aquareal is very good, fish movement is excellent, supports active desktop
and fish interactivity
They devellop more fishes and other creatures.
But i must also say that the serenescreen aquarium looks more real with his coral and light.
People are so unhappy, that they start making hacks of your fishtank, look after serenescreen .... Toolkit (9mb), where you can make your own version of Jim's Tank
Develloping more creatures isn't that hard, and doesn't take that much time with ex. 3d studio, heck look at the toolkit package, it's complete with illustrated instructions.
Monty