arowana tank How did the colorful fairy die for the first time

　　The temperature in Guangdong is 25 to 30 degrees Celsius, and the temperature difference is relatively large at night. There is no heating rod. Has anyone analyzed the cause of death?I bought two and the other is still aliveDongguan City, Guangdong Province========How did the fish friends of the Xianglong Aquatic Alliance comment==

　　YDaq202m Yuyou said: It should be a water quality problem
Dachun 9 Yuyou said: This fish is quite bigThe most expensive red arowana species@Graphic The most expensive ornamental fish?Red Arowana"Tian Wang International Red Arowana/Red Arowana Ascites?Red Dragon Fish Deworming Medicine,Fire Unicorn Red Dragon Fish$The red dragon fish is dead, the gills are open~How old are your red dragon fish$Super scarlet arowana price%Red dragon fish mouth picture! Betong Fish，arowana tank How did the colorful fairy die for the first time！