Most fish tanks have something on the bottom — often gravel in freshwater tanks, but sometimes sand or other materials. What substrate is best for your tank? Colored gravel is popular among casual fish keepers, but not often seen in a serious hobbyist’s tank. Why? If the fish should be the main focus of the tank, brightly colored gravel can be distracting from the living creatures. Colored gravel doesn’t look at all natural, and many serious hobbyists want their tanks to look like a little piece of nature. Light colored gravel can make fish nervous or anxious — the fish … Continue reading →