Is this lava rock and ceramic rings? pic inside

[StreetCypher]

Don't know whether this is white lava rock or crushed coral.

And the ceramic rings i use are much more porous than these. Same thing?

And yes, crappy pics, macro setting doesn't do its job

 

[iamchris]

I have no idea about the rocks, but the more light you use, the easier it will be for your camera to focus in macro mode.

 

[cloud]

All the lava rock that I've seen is a dark brown to balck colour. And that's stuffs more coral coloured, So though I'm not a rock expert I'd say you've got coral in the top pic.

 

[ashdavid]

The bottom pic is a strong type of ceramic ring, it wont fall apart after being used for a long time. Some of the really porous rings fall apart after a couple of years, but the advantage they have is that they do allow more surface area for the bacteria to colonize. I would have to say that those rocks are not lava rock, but I am no rock expert.

 

[Raskolnikov]

Can you get some muriatic acid from a "home improvement" type store? A few drops on the rocks/coral should rule out one or the other.

 

[StreetCypher]

Thanks for the replies,

I threw a handful of the "lava rock" in a bucket of water, and after almost a week the ph has not drastically changes, it actually went down a little.