Most people probably know my story already. My tank has been running since september 30th of this year. I have 9 fish in a 20 gallon aquarium(2 anglefish, 4 mollies, 2 guppies & red tailed black shark). Anyway I've been testing my water quality and have slight ammonia & nitrite levels. Would it be the BEST idea to do daily water changes until the beneficial bacteria develops? I ended up taking advice from another topic I posted on about putting a foam filter in my hang on bio wheel filter on Saturday to eventually replace the disposable carbon filter cartridges.