Is my coral bleaching?

[mrshollyc]

Two questions here. Does any know what this coral is? My LFS gave us a freebie frag and we can’t remember what he called it.
Secondly, is this white at the bottom bleaching? Is there anything I can do to stop it? Everything else in the tank seems to be doing good.

 

[Lavey29]

STN or RTN can typically start at the base. It may be acclimation stress. Do you know exactly what those corals are? Is it a stylo or birdnest?

 

[mrshollyc]

STN or RTN can typically start at the base. It may be acclimation stress. Do you know exactly what those corals are? Is it a stylo or birdnest?

No; I don’t know what it is. We’ve had it for about two months.

 

[Pistondog]

Stylopora or pocillopora.
Is the white area expanding?

 

[vetteguy53081]

Two questions here. Does any know what this coral is? My LFS gave us a freebie frag and we can’t remember what he called it.
Secondly, is this white at the bottom bleaching? Is there anything I can do to stop it? Everything else in the tank seems to be doing good.

Looks like stylo and susceptible to this due to shading (area where there is lack of light)
Other causes are:
- Alkalinity spike
- Temperature spike
- Salinity spike
- Low dissolved oxygen
- Poor water quality related with phosphate levels up to 5 ppm
- Change in water flow
- Changes in brand of salt
- Bad test kits giving faulty results

 

[mrshollyc]

Stylopora or pocillopora.
Is the white area expanding?

Yes; this picture was taken in February. I’d say the white area has climbed about a 1/2 inch or so since then.