I'm so confused on how this happened. I had read that you should go to ace or somewhere and buy a thing of ammonia and actually add it to help start the cycling process and I haven't even done that yet. All I've done is set the aquarium
up, put in new gravel that I rinsed off after buying in warm water, same thing with plants, and added water and dechlorinator. I was given this aquarium by a friend and the filter she gave me didn't work, and a member here suggested that I keep the old carbon cartridge and floss and keep
them in my aquarium until I got a new filter and use them instead of the new ones. Could this have come from the old carbon cartridge?