1.Biological filtration refers primarily cultured in a biological filtration system in failing oxygen to survive heterotrophic bacteria (anaerobic bacteria) and oxygen to the survival of aerobic bacteria (autotrophic bacteria), oxidation decomposition and restore the role of decomposition, make perfect breeding quality desired level, which is called biological filtration. Biological filtration in addition to the application in breeding discus, the marine ornamental fish breeding must also use this method. Culture biological filtration system requires after a longer period of time to be effective, at least one week to one month. In the early days, to give biological filtration system added liquid nitrogen fertilizer, or serving a dead fish rotting fermentation allowed to provide nutrients for the denitrifying bacteria. While the filter bed water oxygenation, prompting nitrifying bacteria flourish, biological filtration system early maturity. Once the biological filtration system forms, make the aquarium water quality physical and chemical indicators have reached the standard of perfection, water clarification and stability, good fish life. 2.Mechanical filtration of the use of physical methods aquarium suspended fine material and separating the circulating water, the mechanical filtration is only a coarse filter, the filter selection based on different materials, may also play a certain degree of biological filtration function. This method is the use of different types of submersible pumps, pipeline pumps, filters, pumps and filters and other small cycle power as water quality, water filter through biochemical effects on the filter and filter nitrifying bacteria, the turbidity can make in a short time water quality became clear, the aquarium has become a widely used method. 3.The main role of chemical filtration is to remove organic nitrogen compounds in water quality, increase dissolved oxygen in water, biological filtration system to ensure the ecological balance of nitrifying bacteria. Law mainly refers to the activated carbon filter and ion exchange resin filter filter foam fractionation method is the use of unique filter adsorption capacity to achieve the purpose of water control, the aquarium is a common filtration methods.
