Common cause of fish disease can be infectious organisms (bacteria, viruses, fungi, parasites), environmental stress from poor water quality (high ammonia/nitrite, low oxygen, temperature changes), overcrowding, improper diets, and the introduction of disease from new fish. These factors weaken the fish's immune system, making them susceptible to opportunistic infections that can lead to symptoms like fin rot, lesions, and parasitic infestations. To prevent or solve mentioned problems, some effective treatment solution are represened here.