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). Read more.
Aquarium Moss 101. There are many different types of aquarium moss with a variety of different uses. There are ten common types of moss that make beautiful aquatic scenery. Below are the types and differences between them; decide which of these will be the most beneficial to your fish. Java Moss.
There are three general categories of algae: filamentous, planktonic and attached-erect algae. 1  The filamentous or pond scum or moss forms greenish mats upon the water's surface. The algae usually begins growing along the edges or bottom of the water body and mushrooms to the surface.