1, reason: Parrot fish is aggressive, mouth gets hurt very easily. If the injury is not treated in time, coupled with the deterioration of the water quality in the fish tank, the mouth of the parrot fish will be infected with bacteria and become black or white. Bacterial infection is only discolored in the early stage, which is easier to treat, but it will fester in the later stage, which is difficult to treat.
2, remedial method: Prophase can need not medication, because medicaments can produce harm to parrot fish more or less. The parrot fish can recover slowly by changing the water and maintaining the water quality in the fish tank. Later, when it is serious, you need to use yellow powder bath, if the effect of yellow powder is not good, you can use malachite green solution. It's better to choose drugs according to the severity of the disease, and don't use specific drugs as soon as you get sick, otherwise it will increase the drug resistance of fish.
. 1. Reason: Slap the fish tank hard or shout at the parrot fish loudly, which will frighten them. Parrot fish behave differently when they are frightened, some will blacken their bodies and some will fade. Blackening of the mouth is also a reaction to shock.
2. Treatment: Eliminate the factors that frighten the parrot fish, move the fish tank or frightened parrot fish to a quiet environment, and then wait for them to recover by themselves.
