you can get a booty grab bundle which is a bundle of fish that are prone to starting the booty grab game (i dont remember them all but if i remember correctly ninja fish and dark knight fish were in that bundle)......all fish have a chance of starting the game so having a fish in your aquarium is really all you need to have booty grab but some fish are more likely to start up a game.....also having multiple fish who have a high likelyhood of starting the game is the best way to guarantee that your aquarium does have the booty grab game
What the fish dropi know booty grab and fish drops are mainly unrelated but it's still a good link to have