Coral crash?

[Dylan7huskies]

I’ve had this tank running for 2 years now. Salinity is at 1.024. I haven’t tested anything else. I did a 50% water change. Now my coral is all dying (green star polyp, zoas, green leather, pulsing Xenia) I did have a blue chromis and anemone die recently.

any thoughts ?!

 

[ReefKidDarian]

it looks kewl

 

[ReefHorse]

A 50% water change can be pretty drastic if all your parameters aren't similar, not just salinity. Was the alkalinity of your new water in line with the tank's water? Big alk swings done that quickly can be pretty detrimental to your corals

 

[F i s h y]

50% water change also drastically changes your available nutrients levels. All of the coral you listed like "dirty" water.
What are the rest of your parameters.
What are your set up specs
What prompted the water change

 

[ckozma]

Anemone can do it. Toxic something or other when it dies polluting the water. Do more large water changes is my recommendation.