In aquarium mode, kick out every fish that tries to destroy the reef EXCEPT the ones that just eat the colored particles. There are 5 slots for enemies to ravage your reef but if you have the tiny fish just eating particles and you don't poke them, you wont have to spend time poking whales and annoying fish. Thumbs up so people can see!
 "Frantic 3"){kind=icon}
 "Notebook Wars 3"){kind=icon}
 "Kaleidoscope Reef"){kind=icon}
 "Shore Siege 2"){kind=icon}
press M