Coral die off

20gallonreefer000 · 2026-07-25T19:59:35-0400

The tank is a mixed reef and has been running for 2+ years. Over the last week or so I've lost a torch, a birds nest, my montipora digitata wont open and I've lost a head on one of my torches. My parameters are good(8kh, 450calc, 1500mag, 1.026salinity, 10 nitrate and 1 phos). I was dosing my tank with prazi but that ended on the 5th and I followed all of the appropriate protocol. I recently had a disconnect on my dosing pump but my parameters never got into any dangerous zone. I'm pretty stumped. My other corals aren't showing any signs of stress(acros, zoas, acans, etc.) and I've had the same routine on the tank for the past few years. I have no predators, parameters are good, none of my equipment is failing or rusting, nothing major has changed. If anyone has had something similar happen or has any ideas what could potentially be causing it, let me know. I'd like to prevent any more die off. I just did a water change and started carbon. Thanks in advance.

CoralB · 2026-07-25T20:23:39-0400

20gallonreefer000 said:
The tank is a mixed reef and has been running for 2+ years. Over the last week or so I've lost a torch, a birds nest, my montipora digitata wont open and I've lost a head on one of my torches. My parameters are good(8kh, 450calc, 1500mag, 1.026salinity, 10 nitrate and 1 phos). I was dosing my tank with prazi but that ended on the 5th and I followed all of the appropriate protocol. I recently had a disconnect on my dosing pump but my parameters never got into any dangerous zone. I'm pretty stumped. My other corals aren't showing any signs of stress(acros, zoas, acans, etc.) and I've had the same routine on the tank for the past few years. I have no predators, parameters are good, none of my equipment is failing or rusting, nothing major has changed. If anyone has had something similar happen or has any ideas what could potentially be causing it, let me know. I'd like to prevent any more die off. I just did a water change and started carbon. Thanks in advance.

Just curious, do you have a pest control company come in ?
I had something like this happen an I couldn’t figure out what was wrong and the only thing was the pest control company. I couldn’t prove anything but I did numerous water changes and finally it seemed to take care of it . I no longer have pest control from that point forward. Just a thought .

kevgib67 · 2026-07-25T20:28:18-0400

I was going to suggest carbon and water changes but you already have that covered. As you already know your parameters are good. Hopefully the changes you have made make the difference, good luck!

20gallonreefer000 · 2026-07-25T20:37:08-0400

CoralB said:
Just curious, do you have a pest control company come in ?
I had something like this happen an I couldn’t figure out what was wrong and the only thing was the pest control company. I couldn’t prove anything but I did numerous water changes and finally it seemed to take care of it . I no longer have pest control from that point forward. Just a thought .

Nothing like that. I can't think of anything that could have contaminated my tank, but that's definitely worth considering.