Dennerle Nano DeponitMix 1 kg.

Deponit mix acts as a long term nutrition store for waterplants, so ensuring magnificent and healthy waterplant growth.
Deponit Mix is a natural concentrate of clay and sphagnum, laid at the bottom of the gravel layer when you build your aquarium.
The substrate is laid in a 1 cm thick layer on the bottom of the aquarium, when the aquarium is built. A layer of gravel of minimum 3-4 cm thick is then laid over the substrate.