Crushed Lava Rock for substrate?

[Trickze]

Hi all! Does anyone know if crushed lava could be used as a substrate? I am wanting to use some sand and lava. I need to use some sand for my polyterus. But I was thinking maybe for the areas where I put my rock caves if I could build it up a little with crushed lava. Would appreciate any input or ideas for some other type that would make a higher level as well as add color. I don't have my fish yet but Tuesday I will be stocking mixed African Cichlid.

Trickze

[The Wedge]

If it is aesthetically pleasing to you...why not? I would leave some sandier areas...but that is just me

[RainMan]

Crushed coral and lava rock is generally to jagged for mbuna.. most of them will dig in it and from what I have heard on cichlid forums... their mouths could develop sores which can get infected.

[greatXpectations]

I wouldn't do it. My guys dive, mouth wide open into the sand digging for food all the time...I think the jagged edges would tear them up pretty quick.

[Incredulous_Ed]

PLus it would be hard to get the lava rock small enough to make it easy to vaccum. Sand would be the best choice.