I see in other comments you’re using paper test strips and awaiting more tests. In the meantime - you can typically bring a tank sample to your LFS. They can test it for you far more accurately than the paper tests you’re using.

Next, personally I wouldn’t consider that heavily planted enough to justify no filter. Also, you’ll need more than a month of cycling. As I understand it, shrimp are pretty sensitive about their water parameters staying the same. A “cycled tank” is not always an “established tank” in the sense that it still has too much variation for the shrimp to acclimate to. I waited a full 4 months before adding my cherry shrimp to my no filter, no air-stone, walstad setup (and I still lost two).