Originally Posted by Beej1254
I've heard mixed reviews. Although I'll be the first to say that I currently have a whole bag from the hardware store in my sump. It's been in there for over a year now and my tank is doing very well.
When I was researching I found both good and bad reviews but no real evidence. I don't know much about the grilling lava rock but I have landscaping lava rock if that's any different.
The only thing I did was rinse and removed the darker blackish pieces. I feel like it's kind of a gamble still even though I use it just because it's one of those things where no one has solid evidence. Even though I have it in my sump and have for just over a year that's not to say something won't leech out eventually.
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I'd be interested in any links you came across to see what work has been done.
I'm guessing by lava rock this is volcanic rock with the holes in it?
On a quick look it looked to me that this should contain more lighter elements in the holes (silica, calcite, etc). However I do have vague recollections of pyrite (iron sulphides) being seen on field trips.
One thought would be is that if there is any secondary mobilisation of arsenic, copper or sulphur then these porous rocks (assuming I have the right ones
) could easily end up with mineral deposits not in the original rock formation.
So one quarry might be fine, another quarry might show this. Some guesses pre-coffee