CATDOLL : CATDOLL: How to kill Daphnia in a grass tank (I raise rice shrimp)

1. How to kill Daphnia in a grass tank (I raise rice shrimp)

Raising a fish called a scavenger can clean up impurities in the water, making it difficult for water fleas to survive without harming shrimps.

There is a special potion, it is very easy to use and it is done in one night.

Clean the aquarium regularly

2. Is that fish tank really difficult to maintain?

Easy to take care of, the algae on the fish tank can be easily wiped off with a sponge. Or, as long as you don't put it in a place where it is exposed to direct sunlight, it will not grow algae at all.

If the water turns green, do not use chemicals to remove it. Using chemicals for a long time may affect the color, physical condition and lifespan of various fish (including goldfish). You should know that in addition to those special ornamental positions, the most important thing about goldfish is the color and fins. If the color changes or the fins droop, the fish is worthless. The best way is to buy water fleas and pour them into the tank. They can be used as fish bait, and at the same time, water fleas can clean the floating algae that make the water turn green, making the water clear again.

Finally, it is water change. Actually, as long as the water quality is not too bad, you can just take out as much old water as possible from the tank and directly pour in as much tap water. Of course, the tap water should be kept at room temperature for a while. The purpose is not to eliminate the chlorine in the water, but to make the water temperature equal to the temperature of the old water. In fact, the chlorine in the water is not terrible. Experienced fish keepers know that the big difference in water temperature is the main reason for the death of fish during water change. I have been raising fish for almost 25 years, and I have always done this. I have never seen any fish die due to water change. So, if you really want to raise fish, it is not troublesome to deal with the fish tank.

3. How are Daphnia eaten by Hydra digested? ( ) A. In the endoderm cells B. In the stomach and intestines C. In the digestive cavity D. In the mouth

Put some water fleas around the hydra. The hydra uses its tentacles to catch the water fleas, injects toxins into its stinging cells to anesthetize the water fleas until they stop struggling, and then delivers them to the digestive cavity through its mouth. There are two ways of digesting food in the digestive cavity of the hydra: intracellular digestion and extracellular digestion. Since there are many cells in the endoderm that can secrete digestive juices, the digestive juices secreted by these cells enter the C digestive cavity, so that the food is digested extracellularly in the digestive cavity. At the same time, since there are some cells in the A endoderm that can wrap food particles into cells, the food can also be digested intracellularly. The digested nutrients are absorbed by the endoderm cells and transported to various parts of the body. The indigestible food residues are still discharged from the mouth to the body. It can be seen that A and C are both correct.

So the answer is: A, C

4. How to clean the water show

But you can use vinegar to clean it. If it is in a container, you can boil it in it.