Axel, that was more or less what I was planning to do. Front/right side of the tank, roughly 1/3 of the floor area to be nothing but sand and rock cover for the apisto's. The other 2/3rds to be amazon ADA and heavily planted. So when you say dont mix them together, i was not intending to literally mix them up.
on that not though, what kind of plants, if any are going to flourish in sand?