Helo,
got a new problem arising in moi tank..

I test calcium weekly, and today got the shock of my life... my cal level dropped from 500 to 200 ! I'm using Sera test kit (i know i know, may not be tt accurate but moi a poor student)

Assuming that the test kit is slightly off, it gives a regular reading of 500 till today.

I dose kalwasser everyday in topup water. I change the kalwasser mixture twice a week. And the 500ppm reading was quite constant for the pass few weeks, till now...

No new addition chemical: usual kal topup water
marine buffer (once a week)

Just a new brain coral. Looks ok still. no adverse change

Only 1 SPS frag look weird, solour maintain but polys not coming out...

Current parimeters:
Cal: 200
NO3: 5ppm (usual reading)
KH: 13 (usually between 11-14)
PH: 8.5

No water change for over a mth. Lazy and don't find a need to.

Thank you