When I tested yesterday the nitrate levels were at 0 which is ideal for their habitat, I just tested again NO2 is still at 0 and NO3 looks to have raised a little possiblylol, cool, ok, feel better, lol, what have your water perams been running? mostly interested in nitrates.
It's API 5n1nitrates should never be 0, whats the test kit you are using?