Its been awhile already since the Ca and other element is out of safe points. As for Ca alone its always at range 340-280... It will be wasted if i'm try to correct it by adding more Ca etc.. that what i thought. In any case water change is always my favorite... even doing large water change is required more salt, its much cheaper compare to add more Ca. What if something goes wrong? more money and more time will be wasted. So water change will be best option for me.

Even tho nothing bad happened yet.. like a coral stress because of low Ca but its a good practise to fix it before its become a problem at the later stage. I'm not really concern bout the low Ca before cause i'm not into SPS. But since i'm slowly adding more SPS it will need more attention to this parameter. It will be a bit tiring process for sure. For now i'm not really sure yet how long it will takes to fill all 3 my tong ... the other thing after that should be simpler.

Anyway i plan this on coming holiday ... bit boring nowadays... nothing to do and everything seem to move slowly. I hope this water change will bring all other parameter to a good point. I'm not really sure if this will effect something else but hopefully its not =D