Just a quick update ...
I went ahead and took a water sample to my LFS
to test for Nitrates. They're test kit (same as mine) showed no trace of nitrates, however I have two NO3
API test kits and both were showing some nitrates - one was showing approximately 10ppm and the other closer to 15ppm.
In discussion we concluded that these are hobby grade test kits so some fluctuation is to be expected and my LFS
operator suggested my kits my be newer than his which are why they are showing Nitrates. Who knows ...
And in regards to Nitrate levels in a FOWLER system ... his words were 'anything over zero should frustrate you and always work to minimize NO3
but fish and inverts like I have are safe until Nitrates hit 40ppm'.
I went ahead and did a 13% PWC
this evening just to be on the safe side.