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.
Red and brown algae are also common in new tanks, when the aquarium is not yet ecologically balanced. These types of algae are also quite common in saltwater fish-only tanks when the coral decorations are cleaned on a regular basis. The small round green dots that form on the sides of a tank are not algae.hosphates may be controlled by using phosphate-removal media in an external filter or by using reverse osmosis water for the aquarium. Cleaner Tanks Grow Algae Faster! This is a difficult concept to understand. It is important to remember that algae growth is a natural, normal process in any aquarium.