Substrates can also have indirect effects on a system's health; dark-colored substrates, for example, are considered by some to be better for fish, as the fish display more colorfully by comparison, and are less likely to behave timidly. Apart from all other considerations, substrates are frequently chosen for their aesthetic qualities.
Indirectly, substrates can influence the health of a system; dark-colored substrates, for example, are thought to enhance fish appearance by displaying more vibrant colors and reducing timid behavior. Substrates are frequently chosen for their aesthetic qualities.