Started my fish in cycling ten days ago in my 75g. Yesterday my nitrites were purple. Way too high. Did about a 35 percent water chances yesterday. Just did my readings and zero nitrites and a good bit of nitrate. Now I did use a piece of filter mat from old tank and some decorations but it took a week for nitrites to show up. Can't believe my nitrites disappeared in four days. Took forever to drop in my other two tanks. Am I cycled? Not gonna add any fish till Tuesday cause I am losing power for a few hours Monday night.