Urgent! Why did Mickey Mouse, who has been raised at home for more than two months, die in large numbers recently?

Have you seen all the fish that float on the water or sink under the water?

If there is, it is necessary to change the water.

You don't need sunlight. You can buy some dechlorinated water in the aquarium.

Or you can go to the chemical store to buy some alum. Just put 1 dot. Don't go too far.

. Wait, blame me. .