The graphics and fish themselves are certainly colourful, but nowhere near polished or dynamic enough to spend any more than two minutes on before getting bored. The aquarium is displayed on the top screen while you work on puzzles below, but is also available through an "Enjoy Tank" mode, where you can interact with your creation directly. You'll be spending this hard-earned money on items ranging from decorations and cleaning equipment to a choice of tropical fish, all in the name of making your tank look faaabulous.There's no way to actually decide where these decorations will be placed, however, as the game will set them down itself without even stopping to ask if you like where that giant fan has gone. Upon completion of each level you'll earn cash based on your performance, with longer combos and speedy completion times netting you the most. So far, so familiar, but the slightly damp ace up Fishdom's sleeve is an interactive aquarium that you can customize by playing through the main game. Nature abhors a vacuum, and apparently so do fish.
The ever-pleasing cascade effect is present, as one row drops down to fill another. Their area of effect is generally set to a limited radius, but the lightning powerup actually destroys all objects of a certain type on the screen. From wimpy fireworks to destructive warheads, these start appearing after you've formed a combo of at least five objects. A few match-three gameplay standards are thrown in for good measure as well, such as certain objects being locked into place until you clear a line using them, and explosives cropping up occasionally to help clear some space.