Been wondering why some of the coral specially brain coral not opening since couple months back. I'm not sure if this silly mistake was the culprit causing me lost my 1st coral(green bubble coral) but I've been checking all other parameter except salinity and always used my default ratio on salt water mix during water change.All other parameter (not including Ca and Mg) are ok.

This "default ratio" which i have been practiced quite sometime almost make me lost everything. This is related to slow increase salinity in every water changes. I just lucky not realise after all gone.

To cut story short, i was checking bout the water level regarding ATO (auto top off) and the effect of salinity. Bang!!! its off the chart!! No time wasted i just quickly doing water changed. Anyway I'm not decrease it in once short hopefully to avoid further coral stress. As for now the salinity is sg 1.026 ... will doing more water changes to lower it down to 1.023.

Conclusion don't ignore simple thing cause it can cost me dearly :D