How to make your own fish tank filtration system

There are three kinds of filtration systems suitable for fish tanks of your size, 1 and top-drop filtration. Advantages: more filter materials can be placed, the filtering effect is good, the dissolved oxygen in the fish tank can be increased, and the production is simple; Disadvantages: because it needs to be placed on the upper part of the fish tank, it is not beautiful enough; Applicable filter materials: white cotton, biochemical ball. 2, bottom tube filtration, advantages: more filter materials can be placed, and the filtration effect is good; Can be placed in the bottom cabinet, without affecting the appearance; Disadvantages: it is complicated to make, and it is necessary to punch holes in the fish tank or buy a special non-porous bottom filter. Applicable filter materials: white cotton, glass ring, biological cotton. 3. Advantages of purchasing the finished external filter barrel: it can be placed in a low cabinet, which is more beautiful and has better biochemical filtration effect; Disadvantages: it is best to install pre-filtration, otherwise cleaning is more troublesome, the volume of filter material is smaller than the above two, and the physical filtration ability is weak; Applicable filter materials: white cotton, glass ring, biochemical cotton. There are also bottom sand filtration options. In addition, drip filtration and bottom filtration are more suitable for fish tanks, and outer filter barrels and bottom filtration are more suitable for grass tanks with aquatic plants.