I'm into my 4th week of doing a fishless cycle on my 5 gal tank using the shrimp method. This week, I noticed that while my ammonia has gone down to about 2ppm, my nitrites have spiked to at least 5 ppm. I've done two partial water changes, so the ammonia went down a bit, but the nitrites are still testing quite high. The nitrates were really high, but came down to around 10 ppm after the water changes.
Why did ammonia and nitrate both go down, but no my nitrite?
Is this a problem?
I've come soooo far - just hope that I can finish this cycle within the next few weeks!