My name is Sandra and I have recently bought a tank and done a LOT of reading. It's all very exciting and can't wait to get some fish BUT, I have been doing a fishless cycle and once completed I did a 90% water change and gave my tank and gravel a bit of a clean up too, I also put aquasafe in the tank after replenishing the water. This caused a nitrite spike in my readings.
I have continued to cycle my tank again for the past week until my readings were ammonia -0ppm, Nitrite - 0ppm and Nitrate - 5ppm, yay! This time, having learned from the previous water change I did, I simply changed 25% of the water (having used aqua safe in the new water and leaving it for five minutes before putting the fresh water in the tank) and yet again I have a Nitrite spike (5ppm) in my tank again.
Am I simply testing the water too soon or is there something not right? I don't understand why I'm getting a nitrite spike after water changes that supposedly reduce nitrites in the tank.
Any help , much appreciated, getting very frustrated !