The required materials are: fish tank 120*55*60, and submersible pump with flow rate of 4,500 liters/hour is selected as the water pump. Filter materials include filter cotton (physical filtration), activated carbon (chemical filtration), biochemical ball (biological filtration) and ceramic ring (biological filtration). Captive fish species: arhat fish.

1. Place a piece of glass with a width of 52*52 on one side of the fish tank of 18cm for overflow, and bond the two sides and the lower part with glass glue; Make a hole in the lower left corner of the glass, which is equal to the water inlet of the pump;

2. Place a piece of glass with a width of 52*40 cm on the outside of the overflow glass, which is used to block water, and both sides are glued with glass; 8.5 cm is reserved at the lower part for grid configuration;

3. After the waterproof glass is firmly bonded, stick a grid on it and above it. Grille can be customized in plexiglass shop, and the dimensions are as follows: lower overflow grille 52* 10, upper overflow grille 52*6, grille hole 5 * 0.5cm, and the lower grille is perforated, with the same size and position as the water pump; Bonding with glass glue;

4, arrange the water pump and inlet and outlet pipe fittings; The water pump is installed in the master cylinder; The water inlet pipe directly passes through the bottom of the agreed filter; The outlet pipe is slightly lower than the water surface and exits diagonally;

5. Divide the filter tank into 3-4 parts with glass strips as required, and put them into the furnace row after being firmly bonded; Can be made of plexiglass, with small aperture and similar grid; Grate is detachable, so don't put it in glass bars or filters; The bottom layer is above the water inlet pipe of the water pump, and the top layer is lower than the overflow glass, and the reserved space can be used for placing filter cotton;

6. Arranging glass rings, biochemical balls, activated carbon and filter cotton in sequence from bottom to top; When the fish tank is running, the highest water level shall not exceed the grate on the top of the glass ring, and the lowest water level shall not be lower than the grate on the bottom of the glass ring; Pay attention to the inspection at ordinary times and add water in time to prevent the pump from burning out;

7. Cut trimming strips or stickers according to the required width and length and put them in the upper and lower positions of the aquarium; If it is for elegance, it is best to cover the side filters together.

In this way, the side filtration and post-filtration of the fish tank are done.