What causes pearling? Good/bad?
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Old 06-22-2007, 08:13 PM   #1
crazie.eddie
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What causes pearling? Good/bad?


This is for a friend of mine. He started a planted tank with a DIY CO2. From what I thought with using CO2, when your plants pearl, it's a good sign, correct? He said he reduced the CO2 when he saw the bubbles on the plants, which he didn't like. I'm assuming the bubbles is a sign of pearling. I always thought that it was good that when pearling occurs in your tanks when using CO2.

I'm trying to get to use this forum, because I noticed he's done allot of things wrong...
- Using Biowheel with DIY CO2
- Ferts while still using carbon media
- CO2 on 24/7, which I mentioned to him that plants do not use CO2 at night
- Using Ferts & CO2 with low lights.
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Old 06-22-2007, 09:43 PM   #2
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Pearling means that the water is saturated with oxygen and its fine. He should keep the c02 going as normal as long as it doesn't affect his fish. A biowheel filter with diy co2 agitates the water surface and allows co2 to escape but if he is seeing pearling everything might be fine. Carbon does remove nutrients from the water and if he wants he should remove it. Using diy Co2 24/7 is ok as long as his fish aren't gasping for air at night I remove the tube from my tank at night. If he doesn't have major algae issues with the extra ferts it shouldn't be a problem but usually it takes longer for plants to use the ferts available to them with low light.
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Old 06-22-2007, 10:42 PM   #3
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photosynthesis causes pearling. The by-product are oxygen bubbles...
Not sure why he doesn't like it because it's generally a good thing.

He can reduce pearling by reducing the wattage on this lights... Better to do that than starve the plants by reducing the CO2 I'm thinking.
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Old 06-22-2007, 11:34 PM   #4
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Quote:
Originally Posted by mistergreen View Post
photosynthesis causes pearling. The by-product are oxygen bubbles...
Not sure why he doesn't like it because it's generally a good thing.

He can reduce pearling by reducing the wattage on this lights... Better to do that than starve the plants by reducing the CO2 I'm thinking.
I was excited when I first seen some of my plants start pearling. I agree with reducing the wattage instead of starving the plants like said.
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Old 06-23-2007, 05:43 AM   #5
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Thanks.

I would have to assume that his plants aren't doing well, due to the above mentioned info. His tanks has had, appears to be, hair algae. He was also amazed of how well my plants are doing in my tanks, since they're both low tech tanks with no ferts.
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Old 06-23-2007, 05:47 AM   #6
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oh, algae pearl too. A lot actually.
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Old 06-23-2007, 07:53 AM   #7
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Quote:
Pearling means that the water is saturated with oxygen and its fine.
Pearling shows that the plants are producing O2 faster than it can dissipate in the water column. That does not mean the water is at O2 saturation.

If the tank in question is not healthy, it's more likely the plants are leaking O2 from damaged tissue than that they are actually pearling.

Pearling shows as big bubbles growing on leaves, leakage shows streams of fine bubbles.
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Old 06-23-2007, 08:56 AM   #8
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Quote:
Originally Posted by MemphisBob View Post
Pearling shows that the plants are producing O2 faster than it can dissipate in the water column. That does not mean the water is at O2 saturation.

If the tank in question is not healthy, it's more likely the plants are leaking O2 from damaged tissue than that they are actually pearling.

Pearling shows as big bubbles growing on leaves, leakage shows streams of fine bubbles.
Pearling is when the water becomes saturated with oxygen during photosynthesis. No more can be dissolved, so oxygen forms bubbles on the plant surface. So I should be correct. here is a picture
Also since the tank is in bad shape the plants could be leaking O2 from damaged tissue like you said
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Old 06-23-2007, 03:18 PM   #9
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Ya better check with Tom about that. I thought so too til he set me straight.
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Old 06-25-2007, 08:58 AM   #10
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I have change the water today and I think the CO2 leak. The plants pearl like crazy. I think it's good because more oxygen for the fish to breath.





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