Gravel and sand for the aquarium are either water-neutral, i.e. they do not change the water values at all - or they harden the aquarium water a little if they contain lime. Whether an aquarium substrate contains lime can be easily determined with a simple test: To do this, take a bit of sand or gravel and pour vinegar essence or another medium-strength acid over it. Lime then starts to give off CO2 and it bubbles. If no foam forms on the gravel or sand, it will not harden the aquarium water.
Aquarium gravel and aquarium sand you can buy in this category of the online store in various beautiful, completely natural colors - sand and gravel as a substrate for the aquarium are available in light and dark colors, in brown, reddish beige, gray or almost white tones, mixed colors or monochromatic. With the different grain sizes from very fine to quite coarse, you can perfectly create structures in the aquarium and aquascape and design natural landscapes. You can also play with different gravel colors or sand colors.
Light sand, for example, also looks very nice in the foreground of an aquarium with active dark Soil - the grand master of aquascaping, Takashi Amano from Japan, has coined the term "cosmetic sand" for this. These sand zones remain unplanted and add an incredible lightness and freshness to the aquascaping layout.
Even the use of really colorful gravel is possible in the aquarium: blue, red, brown, black, white, ... Here in the store you buy only harmless aquarium gravel, colored with non-toxic paints and coated with synthetic resin. It does not release any harmful substances into the aquarium water and is harmless to all inhabitants. Even if particles of the coating or paint particles should come off during heavy abrasion, they are not harmful to the aquarium stock. Please note: In order for the colored gravel to retain these properties, it is very important that it is only rinsed with cold water!
Furthermore, you will find in this store category also lava granules, with which you can work great as a substructure in the aquascape - so you save expensive Soil and at the same time offers the plants and bacteria in the aquascape a very stable substructure, which is not compacted and always well flowed by water.