Inches. -. A shoe size is a numerical indication of the fitting size of a shoe for a person. Several different shoe-size systems are still used today worldwide. In some regions, it is even customary to use different shoe-size systems for different types of shoes (e.g., men's, women's, children's, sport or safety shoes).
Types of Algae. Brown Algae (Diatoms)  This is the first type of algae that begins growing in a new aquarium. It usually grows on the gravel and glass. Unlike other types of algae, this type requires silicates in order to grow. By increasing light levels, this type of algae can be replaced by the more beneficial green algae. Brown algae can easily be scraped off the glass.
Some species of red algae are coralline algae and produce calcium carbonate in their cell walls. There are two types of red corallines. Articulated red coralline has branches with flexible joints. Crustose species resemble coral and donât have branches, growing on rocks, plants or animals. Crustose algae can be found in deep water, up to 500 feet. Coralline red algae grow very slowly, and most fish wonât eat them because of their hard texture.