Anything that removes ammonia like that will not allow the formation of your beneficial bacteria, and when the Easyneo Easylife has finally reached it's capacity, you will be left with ammonia in your tank that will harm your fish. If you catch it in time you can purchase more, but this leaves you with purchasing an expensive chemical compound over and over throughout the life of your aquarium. Just fishless cycle, it's easier and you never have to worry about the bacteria not doing their jobs.