Why can't all plants be as easy as duckweed to grow???
FYI -- PH was making progress, but again plummeted to 5.2 this morning.
I think my current test in progress should yeild same results as your recommendation. Let me know if not:
3 - equal size containers w/ equal amounts of tap water.
cup 1 - only tap water
cup 2 - tap water and hardscape rock
cup 3 - tap water and Soilmaster Select from tank
I am going to let sit til this afternoon. Then test PH of all three. Tap is typically 6.8. Tank previously was 6.6 and then 6.2 w/ CO2.
I sure hope it is the rocks, but I cannot imagine that those few could do this much to the amount of water I have.
Also, the only other thing I did was to clean this new (dusty) tank with a 50/50 mix of water and white vinegar. I realize that is acidic, but it was just used to mist/wipe the inside of the tank... couldn't be it, could it?