When we buy aquarium products in the aquarium, we must remember to pay attention to the distinction, buy carefully, and avoid buying sick fish, then when we buy tropical fish, what should we do? How to tell if a fish is sick?

Beefish

Generally speaking, healthy fish have bright colors, bright patterns and bright eyes. The body shape is clear and smooth. When swimming, healthy fish appear relaxed and stable, flexible and brisk, with stretched fins, and can stop in the water without any movement.

The appearance of diseased fish will be whitish and albuginea, and the eyeballs will be cloudy. The skin is bloodshot, descaled, with wounds or broken fins. Postural swelling and scaly protrusions are symptoms of edema disease. When the sick fish swim, the fins are flat, inclined or the center of gravity is unstable, and they like to sink to the bottom of the tank or float their heads (the swim bladder is abnormal). Leaving a group or being alone in a corner, opening and closing the gills quickly, or failing to open one gill are not healthy signs. In addition, the fish with long backs are generally older, and it is best not to choose them.