Well, last evening my PH was reading 5.8 and this morning it was 5.1. Seriously, can someone explain to me ANY reasons why the PH in water drops? Whether it pertains to hydroponics or not, I'd love to hear it.

I spent some time peeking ever so carefully into my grow tub to see if I could spot any light leaks for example (even though from what I've read if I had algae, it'd create rising ph). I patched up a couple of pinhole light leaks. Nothing much else to report though.

I've tried searching the board as I mentioned, but the search function wont work on "ph" because search terms need to be at least 3 characters, lol.