I have had a very stable tank for several years. I basically ran a poor mans triton method. Last month my rockwork crashed and I started doing more water changes to combat the mess it made. I also went from fritz salt to basic instant ocean. My alk started jumping and got up to 11.4. I brought down to 8.9 or so over the period of a week. In those days some of my corals started RTNing. 3 of my torts did and I lost a WD and some reefraft frags plus a milli colony. I thought I brought it down slow enough but apparently not. Do you think the alk swings caused the RTN.
Alk- 11.4 dropped to 8.9 in a week
Ca- 465-475
Mag- 1500
Nitrate 5ppm
PO4- 0.03
Salinity 1.026
Alk- 11.4 dropped to 8.9 in a week
Ca- 465-475
Mag- 1500
Nitrate 5ppm
PO4- 0.03
Salinity 1.026