Sudden Coral Death

[EvanGrow]

I’ve had a 120 gallon saltwater Aquarium for about 8 years. At the start of last weekend certain corals including a large number of green mushrooms and 2 frogspawn corals shriveled up and have not opened since. Other corals seem fine, including a different type of mushroom. No variable have seemed to change, salinity, lighting, temperature all are stable. Most recent water change was more than a week ago. No fish deaths. Did a water change and nothing looks better in the slightest. Any ideas of what it could be? Thanks.

 

[fishyjoes]

I recently had a similar scenario. I believe my problems were caused by waiting too long to change out my RO/DI filters (carbon blocks most likely)