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Old 04-21-2006, 09:01 PM   #1 (permalink)
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Lightbulb Massive Pearling After W/C?

My plants in my 29 Gallon tank started pearling like crazy right after I did a 25% water change. Is this normal? What, if anything does this mean? I almost never see them pearling day to day, even though I have 130W. It's so exciting to see!!
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Old 04-21-2006, 09:46 PM   #2 (permalink)
 
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Your diy co2 isn't cutting it. If your tank is algae free and plants look healthy, then I wouldn't worry about it. Otherwise, invest in a canister.

Best of luck.
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Old 04-21-2006, 10:14 PM   #3 (permalink)
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Hmm. The plants have been growing steadily, my christmas moss is growing like crazy which it wasn't before I added the CO2, and the only algae problem I have is green spot algae on the tank walls and some java fern leaves which is due to a phosphorous defficiency.

Right now I'm using a big juice bottle for a generator and the Hagen bubble ladder for a reactor. I have no surface distubance and use an internal filter. The bubbles are 85% gone before they reach the top of the reactor and go to the surface. The mix is about a week and a half old and I'm getting a bubble every 15 seconds. So does this mean I just need more bubbles (i.e. another generator)? Or do I need a more efficient reactor?

A CO2 canister is out of the budget range right now and for the forseeable future.

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Old 04-22-2006, 07:38 AM   #4 (permalink)
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My tanks have massive pearling after a water change too, due to the fact that our public water system has a lot of C02 in it. The amount of pearling is always back to normal in a days time.

The only way to know if you have enough C02 in your water is to take your KH & PH readings and use this chart. Keep your levels at a steady 20-30ppm at all time, the closer to 30ppm the better. If you find your levels lower you may want to think about adding a another bottle to your setup.



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Old 04-22-2006, 08:59 AM   #5 (permalink)
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See the thing is, I get absolutely no pearling otherwise. And according to the chart and the calculator on that page, I'm at or above 30ppm, which I highly doubt. If it was that high, with 4.5wpg, shouldn't I be seeing pearling? I'm dosing Flourish, Phosphate, Potassium, and Excel regularly. Is there any other way to measure CO2?
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Old 04-22-2006, 03:48 PM   #6 (permalink)
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It could be that your test kits are off and not given you a accurate reading, causing the chart to show you have more C02 than you really do. Another method some use is to slowly turn the C02 up day by day until the fish start to gasp at the surface then turn it down a bit. However this would be very hard to control with DIY C02 injection. You may just need to add another bottle or change the mixture to see if that helps.



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Old 04-22-2006, 04:53 PM   #7 (permalink)
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Another way to test your CO2 levels is the pH measurement in tank and after degassing. Take a sample of your tank water and let it sit out for 24 hours at room air. Measure the pH. Your target pH should be 1 pH unit below your degassed measurement to yield in the 30 ppm range. This method bypasses things that can throw off the kh/pH relationship.

You have a lot of light for a 29gal tank. If this is an established tank, and all appears to be well from what you mention, then don't worry about it. 'If it ain't broke, don't fix it.' If this is a newly established tank, you really should be aware that you have to make sure you maintain all your nutrient levels good with such high lighting or else, you're inviting algae.
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Old 04-22-2006, 07:57 PM   #8 (permalink)
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I don't want to insult anyone's intelligence here but I've read posts about pearling after water changes before and the thought that always comes to mind is...

couldn't it just be bubbles? My tanks are often full of bubbles after a waterchange depending on how I pour the water in or where my python is pointing.

I realize there's a difference and if I saw your tank the difference could be obvious but I just had to get that question off my chest.

Sorry
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Old 04-23-2006, 09:38 PM   #9 (permalink)
 
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Quote:
Originally Posted by kdh
I don't want to insult anyone's intelligence here but I've read posts about pearling after water changes before and the thought that always comes to mind is...

couldn't it just be bubbles? My tanks are often full of bubbles after a waterchange depending on how I pour the water in or where my python is pointing.

I realize there's a difference and if I saw your tank the difference could be obvious but I just had to get that question off my chest.

Sorry
Generally most folks can see if their plants are pearling vs the bubble just sticking to things. You see an increase in water clarity.


You can also see the growth spurt as well as a reduction is algae, like GSA if they add plenty of PO4.

If done in the AM,the tank wikk have far more pearling late in the day, that is a CO2 issue, the bubbles do not increase from mere water changes, that is when you know the water change added CO2 to an otherwise CO2 limited tank.

Regards,
Tom Barr
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Old 04-24-2006, 11:31 AM   #10 (permalink)
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I believe that the massive pearling after the water change is not due to the CO2 level in the added water, I think that it is because of the oxygen level of the added water.

This is how i see it:

The normal pearling does not start until the water has reached a "high" level of oxygen saturation, this is why there is no instant pearling when the lights go on, it takes depending on the setup half the day.

The water you are changing with are normally extremely saturated with oxygen, you can actually see the gas if you bend the hose a bit then you get a mist of bubbles out from the hose.

This means that the water in the tank after the water change has that high oxygen saturation that every single part of oxygen the plants produce will be visible as a bubble.

http://zoone.se/main/blog/oxygen-level-over-one-week
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