gravel
Unconsolidated mixture of rock fragments commonly used as a substrate in aquaria. Also forms the filter medium in undergravel filtration.
Used in 711 profiles
Results for “gravel”
Ichthyological terms, not general ones.
pea gravel
Gravel-type consisting of small, rounded grains. Commonly-used as a substrate in aquaria.
undergravel filter
A filter which works by drawing water down through the substrate, where the cycle bacteria colonies are located, before returning it to the aquarium. Difficult to keep clean and now considered old fashioned.
hydroponics
Method of growing plants in the absence of soil and using a nutrient solution. The plants may be rooted directly into the solution or in an inert medium such as rockwool or gravel.