Originally Posted by NaganoLiewKun

HI Chinaryukin,

Pls. reference this,

For the rise of water temperature, and strong sunshine, it increases rapidly, and the depth of 青水[Green water] becomes deep rapidly per time, and underwater plankton goes. And when the figure of a fish becomes 青水(green water) which is a grade which becomes hard to see, a "gas disease" will be caused by the probability of about 100%. Moreover, strong sunlight may cause a "tail glow"(oxigen burn) which feels a pain [ tail and the fin ] owing to. Therefore, if 青水(green water) judges that it became a little deep, it is important to perform a water change a little early, and it is important also for using a shade beforehand.