So first my strategy is to go in the game every day and make sure i have lots of money. (5 - 100 mil) and buy packs and instantly sell the baby fish. (sorry baby fish) Then move any valuable gold rainbow or painted fish to tank 2 or 3. 3 is for moneymaking fish 2 is for my collection. And i do this for about 30 minutes to an hour a day and get some good fish usually! Now this is the most efficent strategy without autoclicking hacking save file configuration etc. Now rainbow fish are about 1/8024 odds to get and every fish you get that isnt rainbow increases the chance for a rainbow and it resets once you get a rainbow! Enjoy Chilling!