Need help with disease identification

[tajaba]

Hi guys,

I am in need of some help. In the past 2 weeks, some of my sps corals started to brown out and develop white patches all over the surface of the coral.

The tissue is still living, however, they look to be bleaching. But unlike a typical bleach, they are forming little white patches all over the surface of the coral.

Can someone please help identify this disease?

NOTE: I have several types of corals in a very small tank (40 gallons) and I have noticed that the only type of coral exhibiting this seems to be the branching acros

all my seriatopora, pocillopora and all my LPS are unaffected

please help!

 

[Pife]

STN. Slow tissue necrosis. The question is what is causing it. What are your tank parameters? Do you know what AEFW's are?

 

[71xlch]

STN. Slow tissue necrosis. The question is what is causing it. What are your tank parameters? Do you know what AEFW's are?

AEFW are usually an oval and clearly defined. Could just be the pictures being slightly blurry.

Parameters will help, possibly a swing in ALK?

 

[tajaba]

Hi,

my tank parameters are

ALK: 151-161 (ESV 2 part)
CAL: 452 (ESV 2 part)
MAG: 1360 ( ESV MAG)
PH: Daily change 8.1 - 8.4
Temperature: 25.3 Celcius
Nitrates was reduced down to 0.1 with the salifert test kit
Phosphate tested with hanna at 2 ppm

I run GFO and carbon

the only thing I changed in the past month was the salt because I live in thailand and the local vendor didn't have TM:Bio actif for 3 months so I switched to reef-crystals for the time being

all the corals grew very well for the past year and the tank parameters were very stable.

The only reason I dont think it is STN is because I have seen it before, and STN is usually from the edge and the coral loses tissue.

on the corals pictured, tissue is still intact, but they are bleached, and the corals no longer extend tentacles at night

 

[tajaba]

also, the first picture coral that I am talking about is the yellow encrusting, not the purple digitata (which is just now recovering from being shadowed by a capricornis)

I have been testing my water parameters daily to see what is going wrong. But so far everything is the same as before. I have adjusted my dosing to align with the change in salt because the ALK of reef crystal is much higher than the TM-BIOACTIF. Could it really be just the salt? the tissue on the coral being intact makes me think this might not be STN. Can anyone with experience please chime in?

 

[outssider]

if your phosphate is really 2 ppm then that's a big problem...

is that a typo ??....

 

[whitrose02]

Whoa... PHOSBAN!!! STAT!!!