The Rare Nice Fish can be bred using two Ecstatic Nice fishes.
How to breed Rare Fish
You can only breed Rare Fish with Ecstatic Fishes. Both Parents of the breeding fish must be Ecstatic and you can do that by ensuring that your fish’s happiness meter is 100%.
Most fish in Fish with Attitude goes through a process where you must feed them once they have hatched from the egg. Once you feed them for the first time, they will begin growing and once they finish they will become an adult. Once they become an adult you can use them to dig and help you obtain special toys or decorations. You can also increase their earnings by training them but each training will cost you coins.
The fish has a max earnings of three stages and you can train them three times. Each time will increase their earnings allowing you to earn more for your tank. All of these costs are different for different fishes.