The old fish refers to the fish that misses the growth stage and cannot grow up. This kind of fish generally cannot recover, but there are also some that are not really old fish. It is just because of some reasons that it does not grow up. If it is because the space is too small, you can give it a bigger fish tank, if it is due to illness, it should be treated in time, and then give it a good feed after cure, it can restore body shape.
1. Infrequent feeding: The most likely cause of the formation of the old fish is the problem of feeding, because the fish are relatively strong hunger tolerance, so feeding once a few days will not starve to death, but such fish because of too little nutrition intake, growth period did not grow up, after that will not grow. You'll turn into an old fish.
2. The space is too small: The fish needs to swim in the water, but if the fish tank is relatively small, it can't turn around and can only float in one place, which will make it become an old fish. This situation can be improved, as mentioned above, for a large fish tank, the fish can be able to recover properly.
3. Drug stimulation: Generally, fish rarely use drugs when they are sick. The old three can be cured, because improper use of drugs may cause some side effects to the fish. After being stimulated by drugs, the fish will stop growing and become an old fish. This kind of old fish can not be changed, so it can only be used to prevent work at ordinary times and use less medicine when it is sick.