White spots on Heliopora

[Richard Mrázek]

Hallo,
I have Heliopora in my tank for about two weeks. It was changing skin like leather corals do. And now I can see on surface of skin white spots, like dead tissue?
Tank is cca 400 litres, about 4 months old (plus 3 months cycling).
Salinity 1026
Ph 8.1 - 8.2
Kh 12
Magnesium 1350
Calcium 500
No3 cca 10
Phosphate 0.07

Lights are two Radion G5 XR15 Pro

Thanks for your help.

 

[brmreefer]

Hopefully nothing is chewing on it. If that is the case, then I am thinking it is not happy and could be dying off in small places. I've had my Heliopora do a partial die off due to my salinity being way off due to an inaccurate refractometer. I now calibrate it every two weeks with a known salinity solution of 1.026 that I bought.

I would also let the Alk come down a bit from 12 DKH. That is on the higher end of what I would keep my system at (~8.5 DKH). If there are any PH buffers being used, then I would avoid using that as well (if applicable).

Check at night to make sure nothing is bothering it just to make sure. Hope you figure it out.

 

[Richard Mrázek]

Thanks, I have a Grotech refractometer, I will recalibrate it, for sure. Kh is falling slowly down, by WC.
Only strange thing - I have last two mornings in skimmer purple foam in cup. But no cyano in my tank...