7-day cotton wash and 15-day water change suitable for low density

　　 This looks much more comfortable!Neat and clean! Baoan District, Shenzhen City, Guangdong Province========How did the fish friends of the Xianglong Aquatic Alliance comment==

　　Langlibai 002 Yuyou said: Very good, learn.
Zhongyu-Yuyou said: What size is this tank?
Heming Hidden Treasure Yuyou said: a harmonious home
Longjiang Rabbit Yuyou said: Steady
r19346 Yuyou said: simple and comfortable
Wenzhou_louye Yuyou said: good
13598677677 Yuyou said: the four great beasts
Longer is obedient, Yuyou said: The frequency is betterThe right way for Honglong to change water!Do I need to put salt when changing the water?^How to change the water$How often does the silver arowana change water%Red Arowana prefers new water or old water%Arowana division*How long is it appropriate to raise red arowana#Arowana can change water in a few days~ Cebu Fish7-day cotton wash and 15-day water change suitable for low density？