Black Iron Sand, in fact, is a natural pebbles, but collected in a special geographical environment and then processed through artificial screening to obtain this size and view. In theory, iron sand pebbles surface is more smooth, so it's not ideal to plant water plants directly (the effect is not as good as ceramics). But its natural shape is perfect for the ornamental aquarium bedding, can be combined with some soil and sand together, and is very well washable.
Recommended Dosage:
● 20cm tank: ornamental - 0.5~1kg, waterplants - 1~2kg;
● 45cm tank: ornamental - 3~6kg, waterplants - 7~8kg;
● 60cm tank: ornamental - 4~8kg, waterplants - 10~12kg;
● 90cm tank: ornamental - 10~20kg, waterplants - 25~30kg.