i have the secret to avoiding bacteria bloom in a newly set up aquarium, want to know what it is? ok, 'stress zyme'. use this as the FINAL step after all is done, filters are running etc, add this LAST, and you are guaranteed to avoid bacteria bloom. It has live bacteria in it that will cycle the tank in a day or two. how do I know? I set up a 20 gallon 2 weeks ago monday and there is no sighn of bacteria bloom. the tank is still clear. all is well,ph, nitrites, nitrates, no ammonia. I have a 30-60 gallon filter on it.