No it is established as
biondoa
said. The bacteria has to adjust to bigger bio load (though no fish were added), because the clearmax was taken out. Should be a different spike than cycling - after 24 hours the maximum daily impact of the extra nitrites should be seen and decline from there. With luck the colony has a big enough buffer to be able to handle the nitrites right away (it would test 0ppm after 24 hours). I would wait a week or two before adding new fish while testing every few days to make sure the bacteria really keeps up and had time to create a new bigger buffer.
