I need some advice to anyone willing to read and help! I got a 75 gallon tank a little over a week ago with a used filter with filter media in it. I wanted to start my cycle and did so by adding clear ammonia to the tank. At first my ammonia reading was really high 4-8ppm and I tested everything a few days later and I already have nitrites and nitrates in my tank. I did a quick tap water test just to make sure my normal water was without any chemicals. Here is my question. What do I do now that my tank is reading 0ppm of Ammonia and 2ppm of nitrites and 40 ppm of nitrates. I heard once I have nitrates I am almost done with my cycle so I am continuing to add ammonia to reach 2ppm and see how long it takes to process but I am confused to how quickly nitrates showed up in my tank. Any advice would help! Thank you
It looks like some of the bacteria in the used media has survived and given your cycle a good head-start. Keep topping ammonia up daily (if ammonia drops to 0) until both ammonia and nitrite are at 0 with 24 hours of dosing.