shellieca
Aquarium Advice Addict
High nitrite levels indicate the presence of what will soon be ammonia. How clean is your tank? are you changing out the charcoal every 3-4 weeks? If not, I suspect channeling or leaching taking place in your filter. Overfeeding will cause a spike in nitrite before it turns to ammonia. If you are not overfeeding, count your fish...are they all there. The presence of a dead fish could also five you a spike in nitrites. Water changes will always dilute what is going in. Your nitrites should Never rise when doing a WC unless there is something wrong with the water you adding.
D
Nitrites are after ammonia not before.