Help solve my PH conundrum
So, I've been setting up my 20h planted tank and most has been going great. Look for a journal soon. However PH has been a challenge. Here's they mystery.
My untreated well water has a GH of 1, KH of <1 and a PH of 6. This is even after it sits still, and airated for several days.
I first did my tank with Floramax Midnight and it was causing PH spikes off the chart. Took it out, scrubbed everything out and reset with Flourite and retested. PH 6, KH <1, GH 1 both right after the refill and everyday for four days. Problem solved.
It was a bit too soft, so I buffered with a smidge of baking soda. PH up to 7.6+, KH to 8, GH at 4. After numerous water changes, I've been able to get my KH down to 3 and stay stable, however my PH won't budge down below 7.6(+?). I change up to 75% of the water at a time, and it goes down for 6 hours or so, then starts to creep back up????
Did the Substrate absorb the bicarbonates?
Can my lighting be causing a reaction in the water chemestry?
Only other additions since then have been as follows.
One chunck of African wood (throughly boiled)
Two packs of whisper biomax bio media (ceramic)
Four glowlight tetras and a handful of plants.