From the sentence, "Canopy, fish tank, pomegranate tree, sir, fat dog, fat girl," one could tell how much the old Beijingers liked to raise fish and dogs. The rich and leisurely life in the siheyuan made both the dog and the girl fat.
At the end of summer and the beginning of autumn, the number of mosquitoes gradually decreased, and the rhythmic sound of a teacher reading came from the study.
He moved a recliner and sat under the canopy full of purple grapes. He peeled a red pomegranate, and the ripe pomegranate seeds burst out between his lips and teeth with sweet juice.
The fat old dog lay lazily next to the recliner and licked its tongue from time to time.
The outer wall of the fish tank condensed into fine water droplets due to the abundant water vapor. Under the influence of gravity, the water droplets slowly gathered and flowed down the tank wall, wetting the bluestone.
The goldfish with a pair of bulging eyes spat out bubbles and frolicked among the thick green lotus leaves.
The fair and fat little girl ran happily in the siheyuan.
From then on, a good life was closely linked to pets.
Homebodies raised cats.
Lively and outgoing people raised dogs.
Those who wanted to cultivate their mind and cultivate their character could raise fish.
Of course, the life in the Beijing siheyuan was not something that ordinary people could enjoy. It cost at least 100 million yuan.
In the old days, fish were raised in an extensive way, and they did not pay much attention to other things. Goldfish, grass goldfish, and koi, these cold-water fish were very cold resistant. Even in winter, there was no need to go through a lot of trouble to move the fish tank into the house.
Moreover, the fish tanks in the old Beijing siheyuan were not only for raising fish, but also for fire protection. If a house was on fire, they could get water from the fish tank nearby to extinguish the fire.
Now that the greenhouse effect was serious, there would not be more than two snowfalls in the whole winter. But in the past, Beijing was very cold in the winter, and when winter came, there would be a thick layer of ice on the surface of the fish tank.
When spring came and the ice melted, people would be surprised to find that the goldfish in the fish tank would swim again, as if they were not affected by the ice in the fish tank.
With the development of time and technology, extensive fish farming could no longer meet people's needs because people wanted to raise fish other than goldfish, grass goldfish, and koi. They wanted to raise fish that were more delicate, more delicate, rarer, and more colorful. This was the time for all kinds of aquarium equipment.
Those who were slightly more serious would go to the fish market or online to buy some simple equipment, such as heating rods, pumps, filters, and filter materials. They would also buy some pellet feed. All of the equipment would add up to 50 to 60 yuan, which would basically be enough to feed at least half of the freshwater fish.
Those who were more serious and knew how to search online would buy some nitrifying bacteria, commonly used fish medicines, oxygen pumps, and regularly change the water in the fish tank to feed at least 80% of the freshwater fish.
However, marine life was much more complicated than that. Wang Qian and Li Kun stared at the dazzling array of equipment.
It was impossible for Zhang Zian to take care of the entire aquarium by himself. Wang Qian and Li Kun had to be in charge of the daily affairs. Therefore, he pointed at the equipment and explained the usage to them one by one.
"We know this thing. It's a filter, right?" they said as they fiddled with one of the devices.
"Yes, but do you know what kind of filter it is?" Zhang Zian asked.
They looked troubled. "This … isn't a filter a filter? Just put some grinding wheels and filter cotton in it, and you can filter out the fish feces. "
Zhang Zian shook his head and smiled. "Filters are not that simple. The most important part of the equipment is the filtration system. The quality of the filtration system determines whether the fish in the tank can survive in the long term. "
Filters were generally divided into three categories: physical filtration, biological filtration, and auxiliary filtration.
Physical filtration was what Wang Qian and Kun said about filtering out fish feces and uneaten food residue.
Biological filtration was the nitrogen recycling system that converted ammonia from fish feces into nitrates that were almost non-toxic to the fish.
Auxiliary filtration included a protein separator, an ozone generator, a calcium reactor, a denitrifier, an ultraviolet sterilizing lamp, and so on.
Every time he mentioned a type, he pointed at the corresponding equipment and asked them to remember its appearance and name to avoid confusion. As for the use of each equipment, it would not be too late to remember it later.
In addition, there were different types of lights, heating rods, gravity gauges, various test papers, and other miscellaneous items.
Not all of the equipment was sent by Karl from Germany. Many of them were bought online before he returned to China. There was no need to use expensive equipment that was not important.
Wang Qian took out a hand-held net from a box and asked, "Master, can't you just buy a few hand-held nets? Why did you buy a box at once? Can you use up so many nets? Are you saying that the seller is not willing to sell one net, but only in boxes? "
Li Kun felt the same way. They all thought that such extravagance was not in line with Zhang Zian's style.
There were 100 nets in the box, and they were divided into several colors.
"That's not it." Zhang Zian shook his head. "I was just about to remind you that if you need to take fish out of the tank in the future, you must remember that each tank has a corresponding hand-held net. Do not mix them. Otherwise, if a fish in one tank gets sick, it will quickly infect all the fish."
"Oh, like a syringe that cannot be used repeatedly?" Li Kun suddenly understood.
"Something like that," Zhang Zian confirmed.
Normally, when customers went to fish markets, fish shops, or aquariums to buy ornamental fish, they would see the fish tanks thriving and the shop owners smiling and counting their money. They would never think that the first thing many shop owners would do when they opened their shops in the morning was throw dead fish out while crying … As the saying went, "Thieves eat meat, but not thieves get beaten up".
Fish diseases had characteristics such as slow onset, long cycle, and high infectivity. Basically, by the time the disease broke out, it was already too late to save it. Therefore, early prevention and timely isolation of the source of infection were crucial. Mixing hand-held nets was a very important but often overlooked vector of infection. Many shop owners who were hot-headed enough to open fish shops had to pay tens of thousands or even hundreds of thousands of yuan in tuition fees before they were enlightened.
Karl had specifically reminded him about this.
The first task that Zhang Zian assigned to Wang Qian and Li Kun was to use sticker paper to label each net with a number, from 1 to 100, corresponding to each aquarium tank. They couldn't mix them up.
They nodded in agreement.
"Is there anything else that you don't know what to do?" Zhang Zian asked again.
Wang Qian and Li Kun looked at each other.
Zhang Zian felt that their expressions were a bit weird. "What's wrong? If you don't understand, just ask. Don't pretend to understand. It's okay if you don't understand. Everyone doesn't understand at the beginning. "
"Master, we understand …" They said hesitantly, "but …"
"But what? If you have any questions, just say it, "Zhang Zian urged." I have something to do later. "
Li Kun took out a packaging box from behind him. "Master, you asked us to pack up the package and move it here, but we really don't know what this thing is used for … At first, we thought it was sent to the wrong person, but the recipient was indeed your name …"
He shakily took out a set of light blue bikini swimsuits with very little fabric from the packaging box, one in each hand.
"Master, can you tell us what you're buying this for?"
Zhang Zian said calmly, "Oh, I bought it as a gift."
They said with tears in their eyes, "Don't lie to us, Master! Even if you are a big boss in women's clothing, we won't look down on you! "
"F * ck! What are you thinking? I really did buy it as a gift! "Zhang Zian was almost desperate as he tried to clarify.
God knew what these two idiots' brains were made of!
"But you don't have a girlfriend or a wife. Who are you buying the bikini for? It's not appropriate for a normal female friend to give this to you, right? "They were unwilling to let go of this question.
Zhang Zian was speechless. He couldn't say that there was a mermaid in the bathtub, and it was for her, right?
"This … It's none of your business who I'm giving it to! Can't I keep it? "
"Keep it?"
Wang Qian and Li Kun heard this, and the way they looked at him was upgraded from "pervert" to "big pervert" …
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