I did a 50% water change two days ago any my nitrites were 10+ tonight! so I did another 50% change and got nitrites down to 5 tonight after dumping stress zyme, stress coat and prime in the water. Now my questions are how often do I need to change the water and how much do I change each time until my cycling is complete? Also, Is it bad to put both stress zyme and prime in the water? My tank is a 55 gal and my test kit is the test strips from Quick dip. What suggestions do you have? I really don't want to lose the fish in my tank.