As the title suggests, My Sim Aquarium is a simulation which lets you design
your dream saltwater aquarium, stock it with exotic fish and, optionally, save
it to become your computer’s screen saver.

Before you can actually get fish, your custom tank needs to be set up. Select
from 20 different themed backgrounds and choose what you want inside it –
plants, flowers, rocks and miniature buildings. You can add mollusks and
anemones at this point too. Then it’s off to the store to pick out which fish
should live in your aquarium.

The fun begins when you get your new fish home and inside your tank. Feed and
care for them like you would “real” fish, all the while listening to classical
music in the background or authentic sounding water sounds (ocean waves,
trickling streams, for instance). Consulting the in-game encyclopedia helps to
learn about the different species and how to care for them. Keeping them
healthy is important and you’ll find that cleaning the tank is effortless (a
simple mouse click). When all of your new friends are settled in their new
home, you have the option of going back to the store to get more fish. You can
even trade in fish that you have bred in your tank.

There are two modes of play: Expert and Lazy. Use the Expert mode for breeding
and growing your fish and handling the daily feeding and overall care
yourself. Once you’re happy with everything, go into Lazy mode and the
computer will take over for you. Only in Lazy mode can you elect to make it
your screen saver.