Planted Tank Guru
Join Date: Jul 2010
Location: British Columbia, Canada
How long has it been since you started the cycle?
The bacteria that deal with nitrites take quite a bit longer to develop to a sufficient level to neutralize the peaking nitrite, than the bacteria which deal with ammonia.
Be patient, give it another week or so.
In the meantime, don't add any more ammonia daily or every 2nd day than it takes to increase the ammonia level to 3 ppm, rather than 5 ppm.