White ice crystal-like stuff growing montipora

[Aquavaj]

They look like tiny white ice crystals on the edges of the monti. However they are soft enough to be seen moving with the current. They are causing the skin to recede. There are no other white spots.

I made a newbie mistake by brushing it off inside the tank instead of taking the coral out and doing it outside to prevent any kind of spreading. :headwally:

But does anyone have any idea what this stuff is? I don't see it on anything else. Wish I took a picture before I brushed it off.

 

[minus9]

Without a pic, it's hard to tell? But, from your description, it's probably monti eating nudibrachs. Pull the coral and dip it, inspect for eggs and quarantine it (if you can?). If you have more montis, do the same.


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[Aquavaj]

From the pictures of nudibranchs they look pretty big so I don't think that's what they are. But it's pointless now cause pretty much all the tissue have receded except for a small corner. It'll probably be gone by the time I get home today.

 

[Jndragon79]

Sounds like nudis. I had that issue and lost a ton before I decided to check and sure enough saw the eggs. I dip everything in bauer but the eggs survived.

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[Aquavaj]

After searching "montipora eating nudi" in google it definitely looks like nudibranch. The flesh is totally gone but still some slight purple color in the pits of the skeleton. Is it gone or could it be nursed back?

 

[Jndragon79]

If its white, it's dead but the coral if you can save it will grow back. My advice because I had to deal with them personally earlier this year is the following:

Qt all montis from the tank.
Dip everything in a 3x the recommended dose of coral rx, make sure it's not expired, every other day for 2 weeks.
Then 2x a week for 2 weeks, then once per week and finally observe for 2 weeks. You HAVE to do this regiment because the eggs are resilient to any dip and you want to make sure you get everything that hatches. It takes most eggs 14 days to hatch, hence the strict protocol and then the next month of dipping to cover yourself in case you missed any late hatchers.

While you're doing this roughly 2 month treatment, you're tank is fallow. It is unknown how long the nudis can survive without a host, but if you have any wrasses, they will eat the free forming larvae that hatch.

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[Jndragon79]

With any luck, you beat them. I did following this regimen in my display tank. Did the same thing when I had aefw the year prior. These wars have taught me to qt everything!

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[reeftivo]

you don't by chance have a long spine urchin in the tank, do you?

i ask because they love to munch on monti rims at night among other things.