How your aquarium grows

1. 

   Earn as they grow

   Grown fish earn coins on their own, even while the game is closed. Sell the ones you don't keep.

2. 

   Build them a home

   Plants, rocks, driftwood and sand turn a tank into a biome. Raise its level and rarer fish will breed there.

3. 

   Pair them up

   Put a grown male and female together in the right home and they'll lay eggs. The babies inherit from both parents, sometimes a colour neither of them showed.

4. 

   Add more tanks

   Buy more tanks and bigger ones, from Small to Grand, with room for larger fish and more pieces.

5. 

   Open new waters

   Start in freshwater, then open river, brackish and saltwater, each with fish of its own.

6. 

   Give them a place of honour

   When you choose, an elder retires to the sanctuary, a grand hall where it swims on for good and you can visit.