Originally Posted by
BTLDreef
http:///forum/post/3274728
Almost all rock that you're going to find outside of a fish store is going to have trace metals in it. Calcium based rock does not stand up to different weather conditions and therefore isn't really ideal for gardening, etc (My husband used to design ponds so I actually know quite a bit about rocks sold at garden centers). Lava rock almost always has trace metals in it and really messes with pH levels, it's not ideal for tanks, espcecially saltwater systems. It will fair a little better in fresh, but it's still not great and IMO and IME, lava rock really isn't meant for an aquarium of any sort.
Fake coral/decorations/rock is not going to help with pH BUT, it won't hurt it either, that's why I was suggesting that route as opposed to using the wrong rocks.
Thanks, now I understand. I had no idea it has trace metals in it. To be honest fake coral costs allot more than live rock pound for pound. I have a large piece of fake coral I use to brace up my cave. I paid $60.00 for it years ago. I priced an equal sized piece about 2 years ago for $100.00. Even little pieces of fake coral run $20.00 to $30.00
Somebody someplace wants to break down their tank, and OP can get some live or base rock real cheap, time to go hunting for a bargain.