I'm planning on building a viv and I've come across scoria (lava rock?) being used as a drainage layer instead of, say, leca/clay balls.
Scoria is cheap and so is very appealing to me right now, but I can't find many accounts of it being used and so i suspect there might be a good reason not to use it.

So, is scoria no good for the drainage layer and if so why?
If it is good, why is leca/clay balls so much more popular, what are the comparisons?

Thanks for any help!



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