I have been fighting my 20 gallon for the last several weeks.
2-2 liter DIY CO2
Amazon Swords, Ludwigia brevipes & bacopa caroliniana
no driftwood or rocks
mix of Schultz's & sand as substrate
filter with aquaclear sponges
Blue mystery snails, MTS and ramshorns snails only w/ no fish
Dose flourish and potassium weekly (not EI method)
It is supposed to be my low maintenance tank
It seems that for some reason the KH
has been dropping to 0 thus making the pH drop to 6.0 or below. I add baking soda and without major shocks can get it back to a KH
of maybe 2 and pH of 6.4 (my reading last Sunday) but in less than a week the KH
and pH have dropped all the way down again? What is the problem and what can I do so my KH
does not keep plummetting?