Black gravel in the market?

[oblivion]

thats very small...
hmm do they compact together a lot?
may be a bit crushing on the plant roots if they are compact

[Wzierbovsky]

Ah OK; I think I get what you mean by the gravel being porous. It doesn't look as though they'll compact; in fact, they seem light enough to almost float around, although I'll only be sure after I open up the bag and tinker around with a bit.

[oblivion]

haha hopefully somebody who has tried can advise you on mixing of the gravels
i'm a single gravel man so can't help you on that
good luck!

[Wzierbovsky]

That's OK; I headed down to NA in the afternoon and Mr. Chan let me exchange both the bags of JBL gravel for a third bag of Africana. Hope this all works out now. Thanks for the advice again. )

[Quixotic]

Just curious, what is the name of the JBL gravel that was exchanged? I presume that the JBL fertiliser is JBL Aquasoil?

[Wzierbovsky]

I don't know for certain. The plastic packets of gravel were unlabelled, but they had "JBL" written on them.

[Alfa Low]

I'm not quite sure if the JBL gravel is porous - how can one tell?

The gravel comprises small circular objects though of around 1 to 2 mm diameter each. Pretty small.

I think the substrate you mentioned is JBJ (Taiwan) not JBL (Germany) .