My Darned Ph

[LyraGuppi]

My PH has swung to 8 without my notice. I really need to get it down, but I have no PHDown or Indian Almond Leaves. How do I lower the PH safely? What to you think raised it?
 
Inhabitants:
3 Amazon Swords
1 Argentinian Sword
Alot of River Stones
2 pieces of mopani wood
Play Sand as a substrate
4 Neons
7 Platies
4 Guppies
3 Bettas
8 Cories
 
Edit:
Would it be ok to try oak leaves?

 

[Ch4rlie]

What was your pH previously?
 
I would not advise in using bottles pH down or IAL for lowering pH, as long as you do not have pH swings and is steady, your stocking should adapt to this.
 
The reason i say not to use bottles of pH down or IAL for controlling pH as you will need to regularly top this up and can be somewhat erratic, there fore causing pH swings.
 
Now, there are some things that could cause pH to rise i.e. certain stones / rocks or tap water are the usual culprits.
 
Have you made any changes to your tank recently? added new rocks or substrate? or taken out driftwood or bogwood?