The filter is the life support of the fish tank and selecting the correct type and size for your tank is critical to preserving good water quality and consequently wholesome fish.
There are many choices of filters offered, the most widely used are internal power filters and external canister filters. Some store-bought tank sets may possibly feature one of these filter forms. Other types of filter may be suitable in some scenarios, such as air-powered sponge or small-container filters and undergravel filter systems.
For small to medium tanks, internal power filter is the most preferred choice for an aquarium hobbyist. In larger aquariums, more than one filter may be employed, or they can be put together with an external canister filter system. Regardless of what brand you use, make certain the filter is graded for the size of your tank, or if possible a bit larger, to allow for some margin.
Each has its advantages and disadvantages. Internal power filters, include an electrical pump known as a powerhead that pulls water through one or more filter medium compartments. The entire detail is placed inside the tank, usually fitted to the glass via rubber suckers or a plastic clip. Generally, an airline tube can be connected to the powerhead to add air to the outgoing stream of water; when this reduces the turnover a little the greater turbulence increases the rate at which oxygen can pass into the water.
Obviously, greater turbulence also pushes away carbon dioxide that may be a bad thing in a planted tank where carbon dioxide fertilization is being used. The key benefits to the internal power filter are that it is functioning at the same level as the fish tank so there is no head strain for the pump to work against and that it is normally very easy to take out and clean when needed. The main drawbacks of internal filters are that they tend to be pricey in terms of turnover per cost and that being set up inside the aquarium they are unattractive unless properly hidden behind plants or rocks. Internal power filters also tend to be rather small, so while enough for standard community tropicals, they are much less beneficial in aquariums with large, messy fish.
A healthy, properly taken care of tank can take up to six weeks to set up. Even so, once set up, the tank is easy to manage with regular filter changes, tank cleaning, and suitable feeding of the fish. Freshwater aquarium filters are easy to handle and help you keep your aquarium healthy and balanced for long time.