Join Date: Oct 2002
Location: Wilmington, DE, USA/Philly, PA
Hopefully, someone can shed some light on the phosphate/KH/pH relationship for me...(assuming there is one).
Moderately planted tank with heavier fish load:
MgSO4 - dosing at 0.8ppm/ml daily
K2SO4 - 1/4 tsp at 25% water change (weekly)
pH - 6.0-6.4
KH - 5.5 dKH
GH - 14 dGH
CO2 - DIY injected with gravel vac
PO4 - 0.5-1.0
NO3 - 10ppm
I am also dosing Seachem Iron and Flourish 2-3 times/week @ 1.5 ml per dose.
Feeding fish moderately every-other day.
Why is my pH so low? Considering no other factors other than CO2/pH/KH, my CO2 concentration is approx 93+ppm...
My fish display no signs of toxcicity, breathing or stress. As a matter of fact, the other day I think I caught my two gold barbs working on a mating ritual!
My test kits are fine...my 'out of tap' for pH is 7.0+ (didn't test PO4 or KH/GH of tap - guess I should).
Any help or advice? Is my PO4 level (with some other nutrient missing) causing a drop in PH???
I have had crypt melt lately (tried to transplant some of them) and recently jacked up my co2 production (I use standard mix instead of Jello)...but nothing added to the tank that could contribute to shift (that I can think of).
Almost forgot to mention that I have very light filtration Penguin 125 with sponge filter material blocking the outlet (to prevent surface agitation).
Since I slowed my filtration down, would the carbonic acid created by degrading fish waste cause my ph to go more acidic???