My cycle completed a while ago but my nitrites are still maxed out. I have just started doing water changes. 2 days ago i did a 30% change, following day nitrites still at 5. I am using RO water, no nitrites in this water. I waited 2 days and today did another 30% water change. Nitrite levels still identical and maxed out. I added a load of "cycle" which contains nitrifying bacteria. I am hoping the bacteria kicks in and starts sopping up my nitrites. All other readings are perfect. What else can I do? In 2 more days another 30% change if nothing improves? How long will the bacteria supplement take to work -if it works? Thanks!!