Stripes on long tentical plate coral?

[DracoKat]

I've had my plate coral for about 4 months now and it's doing great.

Today I've noticed one of the tenticals has a purplish brown stripe- not sure if there are other tenticals with the same

What's causing this? It's ok right?
It's a good or bad thing?

 

[DracoKat]

any ideas?

 

[Best Fish-Jake]

Could just be an abnormality... it looks very healthy/happy otherwise! If it wasn't extended I would be concerned but it's most likely nothing to worry about