Ok, what I've heard from the ppl at Biotope Aq, is that there is no difference between the 2 soils except in colour. Both are designed for the same function: to replicate conditions of jungle waters, low pH, soft, etc.
I'm inclined to think that there is some difference in the soils, e.g in mineral content, producing slightly different water qualities to more closely mimic the waters of the 2 respective continents. However, these differences should be minor, and I think that fish from either Africa or SA should be comfortable in either soil.
Just my 2 cents, I'm not very sure about this myself. Hope someone else with more experience can put an end to this mystery.
Matt
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