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Old 12-11-2007, 01:05 PM   #1
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Bubble Coral Question

Just a question about bubble corals. When the two I have were in the LFS tank their bubbles were expanded to the size of Large Grapes, the big blue ones.

In my tank they never seem to get bigger than large peas, or maybe a marble. One is about mid tank, the other a little higher.

Any clue as to why this could be?

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Old 12-11-2007, 01:37 PM   #2
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What lighting scheme were they under in the lfs?
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Old 12-11-2007, 01:41 PM   #3
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Not sure, but not as much as I have. It been a few months though, shouldnt they be acclimated by now?
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Old 12-11-2007, 04:25 PM   #4
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It's not really about acclimation, but more about how much light they need. They expand as needed to balance their energy "input" by exposing more tissue to the light. If you have stronger lights, then they don't need to expand as much to get the same amount of energy.

It could also be a flow issue. Bubbles don't like much flow at all and will stay somewhat "tight" if they're not enjoying the flow path they're in.
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Old 12-11-2007, 07:34 PM   #5
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Kurt beat me to it regarding the increase of photosynthetic light input from polyp expansion. Many do not realize these particular corals, most of the time, come from protected waters and situated vertically in the wild. Many do not tolerate direct light and appreciate a more subdued environment. They also do not photo-acclimate well, which could also be a factor in your case.
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Old 12-12-2007, 02:32 PM   #6
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Quote:
If you have stronger lights, then they don't need to expand as much to get the same amount of energy.
Quote:
Many do not tolerate direct light and appreciate a more subdued environment.
OK guys, which is it? Do they want more light or less light?

Mine has grown to 3x since I almost it lost last year when I was out of country. Now it's huge, inflating like crazy during lights on and then deflating at lights off. It's near the bottom just to the side of direct MH (150w) lighting. I'm planning of fragging this into 3 pieces when I get the time.
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Old 12-12-2007, 03:59 PM   #7
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I'm just going to leave them where they are...If I see no change in another 30 days, I'll try to find another spot for them.
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Old 12-12-2007, 04:28 PM   #8
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Quote:
Originally Posted by cmor1701d
Quote:
If you have stronger lights, then they don't need to expand as much to get the same amount of energy.
Quote:
Many do not tolerate direct light and appreciate a more subdued environment.
OK guys, which is it? Do they want more light or less light?
I'm not really seeing anything contradictory about those two statements. "Stronger lights" is a subjective thing. If you put them under brighter lights than they were under before, they probably won't expand as much. Expansion requires energy, and if it can get the same energy intake from less expansion, that's what it'll do.

Anyway...

From what I've read, while bubbles do come from "shaded" areas where light is at a premium (hence their ability to really expand like the dickens), many can tolerate higher lighting regimes. Then again, many species won't tolerate higher lighting, as cmor mentioned.

Before a snail/crab bashing into it did my bubble in, it tolerated higher lighting just fine. Not metal halides mind you, but about 8" below 196W of CF lighting. It did turn from a white bubble to a more greenish bubble though.

usmcmarc... one thing I just noticed from your post. I just noticed that you were talking about TWO separate bubble corals. How far apart are they? They can put out some pretty good sweepers, and maybe they're having a little turf war?
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Old 12-12-2007, 05:22 PM   #9
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I dont think thats it...I have watched them with the lights out for hours...the longest I have seen the sweepers reach is about 3 inches...they are 6 - 8 inches apart and facing in different directions.
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Old 12-12-2007, 09:22 PM   #10
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I`ve seen mine grow pretty good under VHO lights. What type lights do you have ?
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