Problem with a SPS coral

[O'l Salty]

Does anyone know what could be causing this? I haven't added any corals for months.

 

[saltyfilmfolks]

Is it shaded?

 

[O'l Salty]

No, full light.

 

[saltyfilmfolks]

Hmm, well Ive had flow problems do that or similar on my green stylo. (my purple is getting a shade line)
The greens are usually like weeds. When other bad stuff happened they aren't usually effected.
Id next maybe look at it at night for pests or an overly hunger crab too.. thats really all ive got.

 

[fraggin corals]

Is there another coral near by? Could be sweeper tentacles that is making contact and killing that part of the stylo.

 

[saltyfilmfolks]

Is there another coral near by? Could be sweeper tentacles that is making contact and killing that part of the stylo.

good point. vermetid snail etc...

 

[O'l Salty]

Hermit crabs do like to hang out in that area.

 

[Coronus]

Do you have any wrasses or Mandarins?

 

[O'l Salty]

No, neither one.

The coral is growing but the white stripe looks like it's expanding everyday.