Hi,
Glad you find the info useful. If your plants/fish are doing well and if you don't have any algae problems then I don't see any reason why you should worry about what the pH values are at any time. Chasing pH values will only get you into trouble and "natural pH" doesn't mean anything. Your plants and animals are trapped on stage in a glass box, electrically heated and lit with Hollywood bulbs. There is hardly anything natural about that. There is not much to be gained by focusing on pH. Focus more on clean water, regular tank maintenance, proper dosing schedules and stable/adequate CO2 and you'll be fine.

Cheers,