You can give him phytoplankton, lichens, earthworms, shrimp, red worms, rice grains, corn grains, wheat grains, bean flour and corn flour.
1. Pay attention to increase the oxygen content of water at any time.
2. Don't share it with other carnivorous fish, lest crucian carp become feed.
3. crucian carp will not jump out of the water in most cases, which is completely different from carp.
4. Feed in moderation. If you eat too much, the water quality will deteriorate. If you eat less, the fish will grow longer and smaller until it grows as slender as a dagger.
If you use tap water when changing water, you should expose the water for three days.
6. Get proper sun exposure.
7. The water temperature should be constant.
8. Leave some old water every time you change water, and then add new water.
Extended data:
Feed granularity and feeding rate of crucian carp;
The selection standard of crucian carp feed particle size is generally "small but not big", and when crucian carp is below 10g/ tail, the feed particle size should be 0.5mm；; 10-30g/ tail:1.5mm; ; 75- 100g/ tail: 2.0mm；; 150-2.4mm； For 300g/ tail; When each tail is over 300g, choose 3.2mm..
The fish's food intake is directly affected by the fish's specifications and the water temperature in the pond, so the food intake rate should be adjusted randomly according to the actual situation and should not be fixed.
Adult crucian carp is mainly plant food. Because plant feed is rich in water, there are many edible varieties and a wide range. The stems, leaves, buds and fruits of vascular plants are the favorite foods of crucian carp, and crucian carp can obtain various rich nutrients in the waters where higher aquatic plants such as water chestnut and lotus root grow.
Diatoms and some algae are also the food of crucian carp, as well as shrimp, earthworms, young snails, insects and so on.
References:
Baidu encyclopedia-crucian carp