1 2 m fish tank with a top filter with several

One upper filter is enough, and my original fish tank is also 1200.

But to give you a suggestion, you have a little more fish, although the koi fish do not have particularly high requirements for water temperature and water quality, but in order to create a good environment for the fish, it is better to raise less

Koi fish grow quite quickly, so it is ideal to raise about 9.

The filter cotton should be changed frequently, and the feeding should not be too frequent, 2 times a day, and feed less each time. It is best to raise some aquatic plants at the bottom of the tank to help digest and absorb impurities in the water (mainly food scraps and BB).

Don't add water purifier or anything, it's really not good for fish Add 2-3 layers of filter cotton, wash it every 3 days or so, and you don't need to always replace it with a new one.

My tank has not been changed for almost a year, and the water quality is very good.

It is recommended that you save some water and change 1 3 water every week, the effect is good.

One is enough, add some more filter cotton. After feeding the fish every day, at least 5 to 8 hours after filtering, the water is almost clear, the water clarifier is best to use less, and the fish food should not be fed too much.

Also change the filter regularly.

The reason why the water in your tank is muddy.

1. The density of the fish is too large, remove the first ten, that is, eight will be raised for a year, and they can't be raised when they are big.

2. Your fragile physical cycle is basically the same as nothing.

3. The clarifier is useless, and at most it solves the immediate problem.

Solution. 1. Add an AT3338 external filter barrel, filter without moving, do physical circulation, and clean up the fish feces at the bottom of the tank.

2. Reduce the number of fish by ten.

The main thing is to try to keep the water well, if you don't get it now, to be honest, your fish's future is in jeopardy.

You can put a 12W or 15W one on each side

The choice of fish tank filter is related to the size of the fish tank.

The pump flow rate of the fish tank filter is five to ten times the volume of water. Generally looking at the flow rate, the water in the tank can be filtered 4-6 times per hour. Don't look at the wattage, look at the flow, many high-end inverter pumps have a small wattage, but the flow is very large.

For example, if a fish tank is one meter long, 60 cm wide and 60 cm high, the water capacity in the fish tank is 360 liters. The pump flow rate of the fish tank filter needs to be 2160-2880 litres per hour. The value is converted according to the filtration flow rate is 6-8 times the capacity of the cylinder.

Dear, we are glad to determine the size of the filter tank, and it is necessary to consider the factors such as the quantity, type and feeding environment of the fish residue in the fish tank, and comprehensively design a suitable filtration system. Generally speaking, depending on the size of the fish tank and the depth of the fish pond, etc., the filter tank is usually designed to be about 1 2 to 1 3 of the total water volume of the fish tank (including the fish tank and the filter tank). Take a fish tank with a length of 4 meters, a width of 1 meter and a height of 1 meter as an example, if you do a filter tank of 1 3, the volume of the filter tank is about 4 x 1 x 1 x 1 3 = cubic meters.

The filter tank can be treated by physical filtration, biological filtration or chemical filtration. At the same time, attention should also be paid to the selection of filtration equipment that is of acceptable quality, easy to clean and maintain, and operated and maintained in accordance with the instructions for use. Thank you for your patience, I hope mine is helpful to you, if you are satisfied, please give me a thumbs up, I wish you a happy life.