So I've removed the wood and boiled it like twice with one water change, and scrubbed it a bunch with a toothbrush. Not putting it in just yet, I'm getting new substrate tomorrow because it's been just sand so far. So wood's been out for a few hours now
I did PH again today and I'd say it's between 6 and 6.5 now. Maybe it's removing the wood and the 20% water change that made the difference?
As for KH, I happen to be getting home in the evenings, so it's very difficult for me to see the change from violet to yellow, so my readings might not be accurate at all. I'd say it's 2dKH?
Also did a GH test for the first time ever, it's a 4dGH? 5dGH? either one
Sorry for not exactly accurate results, as mentioned before, I'm working with artificial light here.
and to answer @reefhugger, yes the wood used to be 1/4th of the tank! It's all removed for now though, and since I'm planning on scape rework I'll most likely get some wood cut so it doesn't take this much space