I checked this site out. Looks like Fishman is right. Look at the attached. It speaks about .25 being a serious stress level, and 0 to 0.8 being the range. My kit is 8.0 max. Hmmm....
Guess I always thought that big a shrimp in for that time, you'de be at the top of whatever scale.
Anyway fishman, dark green seems to be the universal fit here, so you are at the top of the chart. I don't know much about bio wheels, but you'll have the bacteria grow there (and the bag of sand if I remember).
Like said, the ammonia will creep down as the nitrites will creep up. Both at zero and you're ready to add fish. After you do, whatch the ammonia again.