Star Fish looked like it had its insides coming out of the top, i did have a swing in pH and nitrites, i removed it from the tank to save any adverse effects on water quality, the hammer coral is also still looking like its dieing off.

Started Dosing NOPOX

skimmer been off for a few days turned on and overflowed eptied to buckets lost about 5 litres.

Whilst cleaning red algae out pump head pipe blew off lost around 25 litres of water.
This all topped itself up with the auto top up so I expect a sharp
climb in pH and possibly a decrease in salinity

Due to higher water levels for around 4 days no auto top up has been used which is mixed with kalk.

One coral showing signs of dieing off where the frag cut was maybe due to the rise in Nitrates and a slight rise in Phosphate.

Auto Top up filled with RO Kalk mix two spoons too 25 ltr