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Hypostomus

Experienced Reefer
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First off: I apologize for rhyming. :)

Here is the description of my tank: http://reefs.org/phpBB2/viewtopic.php?t=48235

In addition, as of today Ammonia = 0, Nitrite = 0, and Nitrates are undetectable. The Calcium level is at a little above 450.

The problem is with our pearl bubble coral. I'm not at home right at the moment so I can't look at it or take a picture, but last week my mother said that it looked a little withdrawn. She decided to move it up onto a rock so that it was closer to the lights and had a little more flow. Today she said it looked better, and that the polyp-ends seemed to be "pulsing" in the water.

However, she also said it has turned browner. From an article here (http://www.reefs.org/library/article/borneman_shimek_warren.html) I read that this can be from a variety of things, and that it also might have been paler than usual when we got it. The corals were added about 3 and a half weeks ago. My mother also said that it seemed healthier now except for the brown color, which she took to be some kind of illness. I explained to her that it just had more zooxanthellae in it and I just want to be sure we're not doing something wrong. All the other animals in the tank are doing very well (including the torch coral, which is the other one I guess I would look at first in case something was going on).

I told her to try pouring a little food near the bubble, but she only started doing that today so I don't know if it's had any effect yet. What food would be best for our bubble, and do you think the browning effect is totally normal or should we change anything in the tank?

On a side note, what glue should be used to attach the rock a coral is on to another rock? Someone (probably a snail) knocked over the torch coral the other day, though it was fine in the afternoon and today after it had been replaced. I would rather have it be more secure, though.
 

Len

Advanced Reefer
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The darkening of the bubble is normal. As you summised, it's just the coral repopulating with zooxanthallae based on its energy needs. If you give it even more light, it'll likely become paler again, but in the meanwhile, it's a good sign of recovery.

All corals have their personal tastes, strangely enough. I'd start by feeding it fresh chopped or diced seafood (cod, shrimp, clams, squid, etc.) from your local market. Feed lightly since photosynthesis will provide the coral the bulk of its energy requirements. I have found that most corals do not need supplemental feeding, but they may benefit from moderate feedings..

To glue down LPS corals, you'll want two-part underwater epoxy. Most vendors sell something of that type and it is reef safe. Personally, I always prefer to securely wedge the coral between rocks instead of using any type of adhesive. Adhesives are kind of clumsy and messy and does effect water chemistry in the short term.

Hope that helps.
 

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