I have owned tanks before but spent a few high stress filled yrs without any kind of a tank. It is amazing how much I forgot. I bought a 56 gal tall waited until I assumed I could add a couple African Cichlids. Several days went by and water tested perfect so I added 6 more. I completely forgot about the 6 week cycle a tank ALWAYS does, which is where I am at now. The Nitrite and amonia levels were sky high so I have done two 15 to 20% water changes in tha last 2 days. Even though I don't love chemicals I added some stress zyme in hopes it will help. My amonia is still around .15 ppm and nitrites are around 1 ppm.
I need some advice please. Should I do a bigger water change? If so, how much?

I need some advice please. Should I do a bigger water change? If so, how much?