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Old 10-17-2007, 01:41 PM   #1
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Whats wrong with this moonstone?

I picked this up from a bargain coral tank...Can anyone shed some light on:

1. The two black spots

2. The bleached white left corner
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File Type: jpg moon1_211.jpg (185.1 KB, 94 views)
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Old 10-17-2007, 02:04 PM   #2
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Looks like both spots are bleaching. Keep a close eye on it to make sure the bleaching doesn't spread. If it does, you will have to frag off the infected areas.
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Old 10-17-2007, 02:13 PM   #3
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The big black hole in the middle is bleaching? What causes it?
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Old 10-17-2007, 07:10 PM   #4
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That doesn't look bleached to me. Looks like either RTN or STN (either Rapid or Slow Tissue Narcrosis) depending on how fast it's loosing it's flesh. I don't see any flesh for it to be bleached. Looks like dead skeleton.
Black part may be the same thing, dead skeleton that is just dark from algea.
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Old 10-17-2007, 08:41 PM   #5
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I believe this is what is. Just a little info

http://www.liveaquaria.com/product/p...cfm?pCatId=427
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Old 10-17-2007, 10:05 PM   #6
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I think it would be a little premature to diagnose a malady such as RTN without knowing any history of the coral considering none was provided, especially given that particular necrosis and/or degeneration of tissue is uncommon other than corals with thin tissue (Acroporiids, Pocillipora spp., Galaxia spp., etc). In addition, rapid tissue necrosis can consume, if not do consume, entire colonies within hours/days leaving little hope for offensive remedies other than fragmentation. However, the first thing that did come to mind was sediment damage. These corals are often mistakenly placed upon substrate where the surrounding tissue is smothered. You can see the tissue margins around the "points" of the skeletal base. Where was this coral located at the lfs and what other corals, if any, were surrounding it? As for the holes, possible predation from a fish, depending on what else was in the tank where it came from, polyp extrusion, or a boring predator.
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Old 10-18-2007, 09:15 AM   #7
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whew....hehehehe

I still say it's not bleached and the tissue is gone exposing dead skeleton. I would also consider, even tho I don't claim to be a marine biologist, a favites sp...which is what I believe this is, to be "thin skinned" as opposed to the fleshy LPS like hammers, frogspawns, torch, plate etc.
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Old 10-24-2007, 07:53 PM   #8
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The 2 "Black Holes" have not grown. Maybe something stung it when it was in the tank at the LFS.

The white bleached areas on the left egde and right edge have now colored up to an all green. So..other than the black spots..it looks like it's recovering well.
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Old 11-07-2007, 03:22 PM   #9
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I've noticed the last 2-3 days that there are long tentacles with a white tip coming out from all over this coral, it almost looks hairy. I know these are the corals tentacles, but why are they out during the day...I thought they only came out at night.
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Old 11-07-2007, 04:24 PM   #10
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I'm guessing they're out right after you feed your fish.

I've noticed that from time to time with my brain coral (platygyra). I take it as a sign that it's hungry and usually will give it a snack that night. I normally feed it once a week, but maybe just like the rest of us, it gets a little more hungry from time to time?

I know my open brain will show its tentacles whenever food is in the tank, then pull them back in about 30 minutes later.

Cool little things!
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