While using sand isn’t mandatory, German Blue Rams do appreciate it as a substrate in their aquarium. Having a sand bottom closely mimics their natural Amazon River habitats where they sift through the sand in search of food. The soft nature of sand also proves beneficial as these cichlids are bottom dwellers and can often be seen digging or resting near the bottom.
However, if you choose to use gravel, ensure it has smooth edges to avoid injury as the Rams explore the bottom. Whichever substrate you opt for, remember that maintaining cleanliness is essential as German Blue Rams are sensitive to water parameters, and dirty substrates can hamper the water quality.