The appearance of brown algae in an aquarium is most often blamed on silicates in the tank water. Just like SPS corals that require calcium to grow, diatoms require silicates to grow. However, there are many other factors that cause brown algae and I believe the excess silicates story is way overplayed.
A U.S. magistrate judge is a judicial officer of the district court and is appointed by majority vote of the active district judges of the court to exercise jurisdiction over matters assigned by statute as well as those delegated by the district judges. The number of magistrate judge positions is determined by the Judicial Conference of the United States, based on recommendations of the respective district courts, the judicial councils of the circuits, and the Director of the Administrative ...
These are officers of the district court who are appointed by a majority vote of the active judges of that court. These judges serve a term of 8 years, and are given duties by the district court judges. Magistrate judges issue search warrants, set bail, and do other preliminary things in criminal cases. They may also be designated to help with several of the steps in the judicial process that occur before the actual trial is held in both civil and criminal cases.