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.
This type of algae develops in tanks with a high ammonia level and cutting plants helps it to grow too as it develops on cut leaves. If plants are cut, the hair algae grows well especially on Vallisneria species. One way to fight against hairs in aquarium is to cut it from time to time as well as plants which are sick.