pH too low

[Ally_pru]

Hey! I am having no luck with raising the pH. I’ve done everything I can think of. add crushed corals, cleaned the filters, and the tank is spotless. I just have no idea what could be lowering it so much. It keeps dropping to 6. Tank is cycled & parameters are good. Does anyone have any other advice on how to safely raise and stabilize pH?

 

[Igneous]

Add rocks, rocks tend to raise the PH value.
Adding leaflitter or soft water will lower it.

 

[Ally_pru]

[QUOTE="Igneous, post: 494782, member: 38453
Add rocks, rocks tend to raise the PH value.
Adding leaflitter or soft water will lower it.
[/QUOTE]
What type of rocks? And what is leaflitter? Thanks!

 

[Igneous]

Googling for rocks to use in an aquarium gave me the following results:
Adding rocks and wood to your freshwater aquarium
This website explains the upsides and downsides of both rocks and wood in the aquarium.
Can I Use Outdoor Gravel or Rocks in an Aquarium?
A very interesting website, they also explain the difference between which rocks to use and which ones not to and how to test rocks to determine which aren't safe.
Limestone Rocks in Aquariums and Water pH
Also a great page, here they explain why it's not always a good idea to change the waters PH value.
How to Raise pH in Aquarium Naturally?
And last but not least, this website dives deeper into the various materials and stones to raise the waters PH value.