JBL Mandao Dark on tumma luonnollinen alusta, jonka raekoko on 1,5 - 2,5 mm kaikille tuorevesiakvaariumeille. Sen huokoinen rakenne edistää juurien kasvua. Sopii kalan kaivamiseen. JBL Manado Darkissa on ravintopuskuri, jossa on korkea rautapitoisuus.
- Dimitrios L. wrote about JBL Manado Dark in 2021:
Quality packaging the bags are very strong. The gravel is quite clean, it needs a rinse, but you can lay it immediately if you want. It's not that sharp, it hasn't got edges, nice feeling to the hand, so it might be good for bottom feeders (I don't have any). The color isn't black, its more of a very dark brown. I liked a lot, very satisfying!