How long is a day on bratz baby fish tanks?

You have to wait it takes about a day. You might be able to make them grow faster with the super grow food. If you go to main menu and adjust the settings to fast that also might increase the growth but it will also make the surroundings and fish grow hungry, and dirty faster. I am a Pro I have the magic mermaid. She takes care of your fish so you wont have to do do it ever again sell the fish you get from the fish mix not the parents. If you see a cute one you want to keep write down which two fish made and when you get the money and the mermaid make it again I did this all in one day good luck.