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post #1 of 15 (permalink) Old 01-31-2009, 06:59 AM Thread Starter
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pearling

just curious , not concerned, why do my plants stop pearling a day or so after a 50% water change? I change the water add my ferts and the tank within an hour or so looks like club soda? I make no changes the next day and it seems that there is far less pearling, and on the 3rd day pearling is virtually gone.
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post #2 of 15 (permalink) Old 01-31-2009, 10:33 AM
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i may be wrong ..

but tap water has alot of co2 in it, alot of times the entire tank pearls after water changes. Looks nice but doesnt really last long haha
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post #3 of 15 (permalink) Old 01-31-2009, 03:13 PM
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I get the same thing. . .I have no clue

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post #4 of 15 (permalink) Old 01-31-2009, 04:14 PM
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Tap water has been cold and under pressure, so it will have lots of gases dissolved in it, both CO2 and O2. When you add it to your tank it is warmer, and not under pressure, so the gases come out of solution, making little bubbles everywhere. That isn't pearling you see, just the dissolved gases in the water escaping.

You can get pearling from a water change because of the added CO2 and O2 in the water, until it is used up or escapes. That will look about the same, but will all be from leaves, instead of being everywhere in the tank. It goes away soon because the CO2 gets used up or escapes pretty quickly.

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post #5 of 15 (permalink) Old 01-31-2009, 05:27 PM
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IMO, pearling is a bit like multiple orgasms – a few years down the line, you start thinking: “Why am I bothering about this..? I've done me best for the tank – I just want to go to sleep now..!”
Oh, come on, you can't ban me again! I'm only talking about CO2 here – there is a limited amount you can inject into any system..!
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post #6 of 15 (permalink) Old 01-31-2009, 10:41 PM
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Quote:
Originally Posted by zoologist101 View Post
IMO, pearling is a bit like multiple orgasms – a few years down the line, you start thinking: “Why am I bothering about this..? I've done me best for the tank – I just want to go to sleep now..!”
Oh, come on, you can't ban me again! I'm only talking about CO2 here – there is a limited amount you can inject into any system..!
Off with his head!

We never come close to injecting the maximum possible amount of CO2 into our tank water - think bottled carbonated water.

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post #7 of 15 (permalink) Old 02-01-2009, 07:10 AM Thread Starter
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well, i inject co2 all the time so the co2 shouldnt escape, and your right it usually just comes off the leaves.
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post #8 of 15 (permalink) Old 02-01-2009, 08:41 PM
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Since I'm kind of in the same boat here, should this just mean I should up my co2 so I don't lose those dissolved gases I have after a water change?

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post #9 of 15 (permalink) Old 02-02-2009, 01:24 AM
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Quote:
Originally Posted by zoologist101 View Post
IMO, pearling is a bit like multiple orgasms – a few years down the line, you start thinking: “Why am I bothering about this..? I've done me best for the tank – I just want to go to sleep now..!”
Oh, come on, you can't ban me again! I'm only talking about CO2 here – there is a limited amount you can inject into any system..!
At my age, I'm just happy to get pearling once a week.

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post #10 of 15 (permalink) Old 02-02-2009, 06:45 AM
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at my age, i'm just happy to get pearling once a week.
rofl
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post #11 of 15 (permalink) Old 02-03-2009, 05:04 AM
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My riccia especially and other plants as well pearl all the time. I inject crazy amounts of C02 into my tanks though and have high lighting. I am under the impression that high high amounts of C02 causes the plants to grow faster (which technically they are using different chemicals causing a reaction which in turns produces oxygen). Correct me if I am wrong but it works in my tanks like magic! Everyday.

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post #12 of 15 (permalink) Old 02-03-2009, 11:33 PM
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I've yet to see any pearling - but my wild guess - and I'd ask others - is that some species are more prone to pearling than others?

Only taking a complete naive stab at it - mostly, because I've seen nothing and am hoping I'm still doing the right thing. I dose CO2 in and I've just skirted the edge of comfort for my fish, so had to dial the bubble rate back marginally; I still obtain 30 PPM, roughly, but have not seen any pearling. My plants seem to be thriving, though, and as long as both flora and fauna do well, how much import to give to this effect (does its absence indicate a less-than-optimal plant metabolism, for instance?).
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post #13 of 15 (permalink) Old 02-03-2009, 11:47 PM
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Pearling is caused by excess O2. If the plants are growing well, and the water is saturated w/ O2, you'll see pearling as the O2 from the plants can no longer dissolve in the water and thus it gases out. You're seeing pearling after a WC b/c the new water is fully saturated w/ O2 whereas your usual tank water is not. Add aeration to your tank, while adjusting your CO2 to make up for the outgassing, and you'll see pearling daily.
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post #14 of 15 (permalink) Old 02-04-2009, 01:24 AM
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does it take high lighting to achieve pearling as well?
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post #15 of 15 (permalink) Old 02-04-2009, 03:24 AM
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One of my planted tanks never gets a water change yet pearls daily. It is heavily planted so that explains the saturation of O2

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