Hi again,
I've finally narrowed down what rocks I have. The original rocks are called Yamaya stone or ADA 山谷石. According to ADA USA, this rock does not affect the pH and GH.
This site is where I got my final confirmation dued to the many excellent detailed photos
http://item.taobao.com/auction/item_...a32760e991.htm
And I cannot resist linking this post that shows the stones underwater, beautiful
http://www.aquascapingworld.com/forum/4233-post1.html
If its not right to link, please let me know...
Apparently, this is only carried by ADA so I'll probably make a trip to Woodlands again once my eye is better.
As for the newer rocks, they're either Seiryu, or Ryuoh. I'm thinking its the latter dued to lower price and easier availability.
ADA USA says:
"The RYUOH STONE is almost identical to the Seiryu Stone in terms of appearance and texture. It has distinctive characteristics just like ones of the Seiryu Stone, sharp and sheer edges and fair grayish-blue color."
Either way, anyone interested to take these newer rocks off my hands? They're of little use to me at the moment.
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