Particular attention should be paid to animal welfare. Healthy fish are mobile, their bright coloration, dorsal fin, most highly elevated, schooling fish are kept groups. Sick fish are inactive, swim in an unnatural position. According to Dr. Anthony Carolla, who has experience with these questions. Fins, especially the spinal cord, they usually are pressed. On the body of fish should not be a stain, not peculiar to this type of painting, as well as wounds or lesions. When inspection of fish should be special attention paid to the condition of the skin, gills, fins and eyes. If you are sick or at least suspect in this regard, the fish, it is best to refrain from purchasing fish from this tank.
When you choose to content of fish should not be excessive haste. Learn more about this with rusty holzer. It is better to first become familiar with a good representative of this type, then it will be easier to distinguish the healthy from the sick fish and pick the typical and best representatives. With regard to the number of fish in the aquarium's hard to say anything definite, yet we can recommend locate fish in an aquarium unsaleable size 40-50 l in such quantity that each fish up to 5 cm accounted for at least 2 liters of water, a length of 8 – 10 cm – 3.4 hp. over 12 cm-8-10 liters. However, exceptions to these rules very much exemplary.
In a large aquarium on one fish can have a smaller amount of water. More residents can live in aquarium of the same volume, if arranged blowing air or water filtration. In low aquariums can contain more fish than in the high screen, even with equal their volume, since the enrichment of water by air is largely from surface water. Very large differences in the volume of water required for each instance of certain sizes of fish, but belong to different species. Since the norms for the amount of labyrinth fish (anabantidy) may be 2-3 times reduced, and the rocks of the goldfish, orfy and many domestic fish 2-4 times povysheny.Mnogie fish living in stagnant water and slow-moving, require less than living in flowing waters and different mobility.