This is just a quick synopsis: If a tank is cycling properly, ammonia and nitrite will be a zero regardless if you do wc or not. Wc are mainly for physically removing nitrate. Nitrate is not nearly as toxic as ammonia and nitrite, but high levels and prolong exposure can cause health issues and/or death......depending on the senstivity of the species of fish.The water change helped and the ammonia is back down to zero. Will definitely be adding that to my routine. The only reason I went so long without one is because I have a friend that had a saltwater tank for over two years that never did one water change. All he did was replace the evaporated water every once in a while. He didn't even know what ammonia was when I asked him about it lol. How did he go so long with no problems but I didn't even go 2 months before I had an ammonia spike?