Concerned

[200 gallon reef]

I have two acros in my 200 gallon tank. One I believe is a birdnest and the other I believe is a pinapple. They are approximately 1 ft apart and the same height in the water column. Out of nowhere my pinapple became bleached and died, the birdnest is flourishing. Any ideas on what the cause could be?

 

[crister13]

Lighting? Parameters??? Is it close to something that could be attacking it? Anemone? Aggressive coral?

 

[reefrunner69]

What are the pictures of? I do not see an acropora sp coral in either photo. I see seieratopora hystrix and maybe a montipora digitata (not sure). I thought maybe they were supposed to be the same coral.