Base of Montipora Digitata turning white

[cjrudy]

The base of my Montipora Digitata is turning white at the base where it's attached to the rock. The rest seems to be going great along with the rest of my corals . Here are my parameters

PH 7.9. (A little low since we closed the windows)
Alk 9.0
Ca 380
Mg 1230

The only thing I dose is Kalk in my ATO

 

[ritter6788]

As clean and white as that is, it looks like STN to me. Keep an eye on it and if it spreads then you'll have to frag the coral to save healthy pieces. If it doesn't spread at all I'd just leave it alone.

 

[Steviereefs]

Hi there,
I'm new to the community and reefing so take what I say with a grain of salt. If you haven't yet double check the parameters first. The PH should be at least 8.2, the calcium should be at least 400, but your pretty close with the calcium. And if your alkalinity is truly 9 you should be good there, but that's what I would double check first is the alkalinity. Also check your salinity. After you double check everything The thing that I would try to address is the PH ,I think 7.9 it too low. 7.9 might seem only a couple of points off but the PH scale is only a 14 point scale so maybe that my seem like a small drops maybe that's where problems like that digitata start. So like I said take what I say with a grain of salt, and wait for another response from a more experienced reefer. Meanwhile double check parameters ,post your salinity, tank size, and check to make sure a power head isn't blowing directly on that coral.

 

[Rydogg420]

Hmm, for it to be that white and clean "cut" I would look for a little critter hiding near that coral and see if its eatting away at night time. I have heard many people say RTN killed thier coral, but I only say RTN killed anything when you have checked everything else and find no other reason for a coral to die like that. So I would look for a bug as I have seen many nasty bugs pop up in a reef tank and munch away at corals, even a year after anything was added to the tank. Somethings can hide and feed for quite some time before it ever touches any coral for you to notice its there..

Also check to make sure another coral is not at war with it.. Some coral can attack about 6 inches away and it leaves no tissue like you show..

 

[Rydogg420]

Hmm, for it to be that white and clean "cut" I would look for a little critter hiding near that coral and see if its eatting away at night time. I have heard many people say RTN killed thier coral, but I only say RTN killed anything when you have checked everything else and find no other reason for a coral to die like that. So I would look for a bug as I have seen many nasty bugs pop up in a reef tank and munch away at corals, even a year after anything was added to the tank. Somethings can hide and feed for quite some time before it ever touches any coral for you to notice its there..

Also check to make sure another coral is not at war with it.. Some coral can attack about 6 inches away and it leaves no tissue like you show..