What to do if the water in the open-air fish tank turns green?

Question 1: Why does the fish farming water turn green? Old green water is also called "fat water". The water quality is opaque and the visibility is only 3-4CM. When it first forms, it is bright green and looks very green. It is comfortable and turns yellow-green after a period of time. The algae in the water are extremely abundant and have developed to the peak stage. However, when reaching the peak, the process of water quality deterioration has also begun. At this time, the amount of water change must be increased to prevent collapse and "greening" (the water suddenly changes Clear and transparent, will be introduced in another post). Transparent green water can easily transform into old green water in spring, summer and autumn. If it has already transformed, it will be difficult to change the water back to clear water through a large amount of water changes. It can only be maintained without "returning to green".

Nowadays, more and more aquarists are using glass tanks to raise fish indoors, and they require clear water quality. Therefore, Old Green Water is mostly used for raising fish in open-air fisheries, courtyards, and balconies. Old green water is one of the best water sources for traditional cultivation, but this water has two sides. If your water has become or is likely to become old green water, I advise you to find out more about it.

Advantages of old green water: There is a lot of algae in this water. It performs photosynthesis during the day, produces oxygen, and decomposes feces and other dirt, forming a virtuous cycle. Its effect is similar to nitrification in Western fish farming theory. bacteria. Green water is rich in color-enhancing substances, which is very beneficial to improving the color of fish. Goldfish stop growing in winter. Use this time to keep them in old green water, which is called "Chengyu". After a winter, although the fish has not grown up, the accumulation of pigment particles in the fish has greatly increased, and the color has become brighter. Moreover, the floating green algae in green water is also a good auxiliary feed for goldfish, which is beneficial to enriching the nutrients consumed by the fish and improving the quality of reproduction in spring. Fish kept in green water usually have better physical condition and their feces are dark green.

Even so, the old green water is a double-edged sword. If it is not grasped well, the fish will suffer from it or even be wiped out. The reason is as follows. Algae in the water produce oxygen during the day and consume oxygen at night. In addition, the fish themselves consume oxygen. After a night in the water, the oxygen content reaches the lowest point at dawn. The fish will float on their heads. At dawn, the algae can produce It will be relieved naturally when oxygen is used, but death from "flooding" is common in severe cases. Fish farming in green water requires oxygenation at night and inspection in the early morning, which is specifically aimed at this point. But everyone makes mistakes, and backyard fish farming cannot be as strict as fish farms. Since I like to raise goldfish in green water and do not use oxygen, even though the density is small, the fish often die due to lack of oxygen. This is one of the disadvantages of old green water. Secondly, goldfish are prone to tail-scalding disease. In summer, the light is strong, algae grow rapidly in the water, photosynthesis is strong, and bubbles are constantly produced. If they are not fed in time or do not feed enough, the fish will swim around for food, and the bubbles will continue to adhere. to the tail and fins of the fish, so that the tail fin floats on the water with the head downward, and then is exposed to the hot sun, causing the tail fin tissue to be injured and congested, leading to tail perm disease. The wound is most susceptible to infection, and in severe cases, tissue ulceration and infection lead to death. Even if the tail fin is cured, it will become smaller, greatly reducing its appearance and even losing its ornamental value.

Question 2: Why does the water for raising goldfish in the open air turn yellow-green when exposed to the sun? There are green algae in the water, and this color appears after being exposed to the sun. However, this is not a bad thing, because green algae can produce oxygen and is a kind of living water.

Question 3: How to change the water quality of the open-air pool 1. I think this article is very good, I recommend it to you:

Water source and water quality maintenance series

1. Water source

(1) Tap water: Tap water is the domestic water used in our daily life. The source is convenient and easy to obtain. After certain technical treatment, it is the best water for raising freshwater ornamental fish. Tap water is a disinfected water source. It contains too many chloride ions and cannot be used directly to raise fish. Generally, the cool-drying method is used. The tap water is placed in an open-air ventilated place. With the help of air circulation and sunlight, the residual chlorine in the water is volatilized and the amount of dissolved oxygen in the water is increased. The cooling and basking time is more than 24 hours in summer, more than 48 hours in spring and autumn, and longer in winter. In addition, chemical treatment can also be used, that is, using large soda (sodium thiosulfate) to neutralize the chlorine in the water. Generally, 2-3 grams per cubic meter of water or 5-6 grains in 10 liters of water are required. If you use too much baking soda or encounter high temperature weather, the water quality will often turn cloudy and deteriorate, so you should pay special attention to it.

(2) Well water: Well water is groundwater, with hard water quality and constant water temperature. Well water needs to be exposed to the sun for more than 12 hours before use to balance the water temperature with the surface water temperature and increase the amount of dissolved oxygen in the water.

(3) River water: natural water, soft but turbid. Before use, purify the sediment in the reservoir or filter it before use. The river water contains many natural baits, which can make the colors of ornamental fish more natural and bright.

2. Water quality maintenance

When goldfish and koi are in an open-air environment, the color of their feeding water changes into clear water, green water, old green water, clear water, and brown water. But in the aquarium, due to the use of circulating filtration equipment, the water quality is clear all year round.

(1) Clear water: Clear water refers to a colorless, odorless, transparent water source with sufficient dissolved oxygen and very few plankton, which can effectively increase the appetite of fish and promote its growth and development.

(2) Green water: Green water contains many green algae, common ones include chlorella, navicularia, botrytis, etc., which are auxiliary bait for goldfish or koi.

The water quality of green water is stable, which can promote the bright color of fish bodies, keep them warm and provide bait, and is the best water source for the healthy development of fish.

(3) Old green water: It is developed from green water. A large number of algae die in the water, and the water color changes from bright green to light green. Due to the large amount of dead algae at the bottom of the tank, the water quality is likely to deteriorate day by day. Old green water is mostly used in winter. Because the water temperature is low in winter, algae grow slowly and the water quality can be maintained for a long time.

(4) Clarified water: Clarified water is converted from clear water or light green water. The water quality is extremely soft and has high transparency. The growth and consumption rate of algae in the water has reached a dynamic balance. The water quality is stable and the water color is clear. It is a good water source for the growth and development of ornamental fish.

(5) Brown water: Diatoms multiply in large numbers in the water, beneficial algae decrease, and water quality stability decreases. It must be replaced in time.

Water quality management for goldfish breeding

"Raise fish first, raise water", this old saying highly summarizes the importance of water quality management. Only when the water quality is good can goldfish have a good life. environment and live healthily in it. (1) Water source: The main source of water for household fish farming is tap water. Tap water contains a large amount of free chlorine. Chlorine can easily damage the gills of goldfish and affect breathing. It must be exposed to the sun for 2-3 days or treated with sodium thiosulfate before use. The easiest way to raise fish is to use tap water that has been dechlorinated. Fish farms sometimes use natural water sources, such as rivers, lakes, and ponds. When using it, pay attention to whether the water quality is clean, whether there are toxic substances, and whether there are diseases and insect pests. It is best to use it after disinfection and sun exposure. (2) Water change: It is best to change the water once a day. Depending on the water quality, the time for water change is uncertain. 1-2 hours after feeding every day, extract the feces and residual bait, and then add the same isothermal new water. For large aquariums ( There are filtration systems) and fish ponds, and the water is usually partially changed every week. (3) Filtration system maintenance: For aquariums with a filtration system, there is no need to replace new water every day. The filter material in the filter box should be cleaned about once a month. Activated carbon can generally be replaced once every three months. How to change the water in goldfish farming

Senior goldfish farmers have long had the experience of “raising fish first, raising water first”, which shows that the quality of the water will directly affect the normal growth and development of goldfish. The purpose of changing the water is to remove dirt (garbage, fish feces, remaining feed, and old impurities) in the water, keep the water clean, adjust the water temperature, and increase oxygen in the water, thereby ensuring the growth and development of goldfish. If you want to raise goldfish well, you must have a preliminary understanding of the fish breeding water: 1. Raw water refers to tap water or well water that has just been released but has not been dried. The water temperature is often quite different from the water temperature in fish ponds (tanks), and it contains more chlorine. This kind of water is extremely harmful to goldfish.

2. New water is tap water, well water, spring water... >>

Question 4: Why are green hairs growing in your fish pond? This is because the water in your fish pond is eutrophic, which means it is redundant. Too many nutrients cause algae to grow too fast

There is no particularly effective method, usually fishing with a net

You can buy inhibitors on the market, such as sodium hypochlorite and copper sulfate

If you are raising food fish, use it with caution, otherwise problems will be very troublesome

It is best to raise some fish that eat algae and raise some at the bottom of the fish pond Aquatic plants absorb these nutrients, but only slowly