I've done a lot of work.
For the tank
Use diluted bleaching to clean,then use water to wash it.
Let the tank dry.
For the filtration Tank
Use diluted bleaching to soak for one day, then water washing , soak water for one day,
Let the filtration tank dry for 2days.
For ceramic ring
Use diluted bleaching to soak for one day, then water washing , soak water for one day,
use hot water to wash.
Let the ceramic ring dry for 2days.






