How much CO2 - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-04-2005, 01:36 PM Thread Starter
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How much CO2

Hi I was setting up a new 55 gallon (210ltr) tank about 4 days ago. I have 120W flourescent loghting for now. I did a Ph measurement yesterday and it showed 6,2 - 6,3.
I was wondering how much CO2 brew I should use, in my last set up I had 2 2L bottles and was wandering if should go with 2 4L bottles this time, do you think that is to much??
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post #2 of 9 (permalink) Old 03-04-2005, 03:20 PM
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What is your KH level? You can't really determine the CO2 level without both pH and KH measurements. As your pH seems pretty low right now, I'm guessing your KH<3, which can lead to stability issues. I'm guessing you'll need to bump up your KH. On a 55 gallon with DIY CO2, the more bottles the merrier.
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post #3 of 9 (permalink) Old 03-04-2005, 06:57 PM Thread Starter
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So it would be better for me to go with 2 4L bottles than 2 2L bottles? 2 4L would not be to much?

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post #4 of 9 (permalink) Old 03-04-2005, 07:21 PM
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Sven:

Measuring KH is the first step. I think the target is ~4* and can be raised with bicarbonate. With DIY speed is controlled by the quantity of sugar and yeast. If you have smaller containers you might run more yeast and change the bottles out often. Having two bottles is a good start as you can stagger them so that flow is more uniform. If you have soft water you should add bicarbonate to the DIY too.

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post #5 of 9 (permalink) Old 03-04-2005, 09:05 PM Thread Starter
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Here come the readings, just finished measuring.
Ph: 6,2-6,3
Kh: <10 mg/l
Gh: 80 mg/l

This Kh reading was the lowest available on my hagen GH/KH test kit, do I need a more delicate test?

I can add bicarbonate with baking soda, right? How much should I add to a 2l CO2 brew??

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600 ltr (160g) planted tank. Pressurized CO2, Eheim 2260 & Sacem Marathon 2000, 156W T5.
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post #6 of 9 (permalink) Old 03-06-2005, 04:20 AM
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Your water is quite soft. I would make beer with it.

I would add some crushed sea shells or limestone to increase the calcium your plants will need to grow.

You can add sodium bicarbonate to make swings in pH smaller but I don't think thats a problem. I've got the same test kit and I get a kH of <70mg/l and a GH of <160 mg/l.

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This message is always under construction: 75-gallon tank; 2, Eheim 2026 filters - one twice broken; Tek Light with 4, 54W T5s (6000K) ; Sand on top of 4:1 sand:clay mixture; Milwaukee CO2 controller; PlantGuild vortex CO2 reactor; pH = 6.6, kH=70mg/l, GH=120mg/l; EI; Flourish excel on 50% weekly water change: AGA Member.
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post #7 of 9 (permalink) Old 03-06-2005, 08:12 AM
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Quote:
Originally Posted by Sven
This Kh reading was the lowest available on my hagen GH/KH test kit, do I need a more delicate test?
You can increase the accuracy by doubling the volume of water to be tested.

With the Hagen kit (I have the same one)...
1 drop in 5ml represents 10mg/l of CaCO3 (carbonate hardness)
1 drop in 10ml represents 5mg/l of CaCO3
1 drop in 20ml represents 2.5mg/l of CaCO3
1 drop in 40ml represents 1.25mg/l of CaCO3
1 drop in 80ml represents 0.625mg/l of CaCO3

So by taking an 80ml sample, you can get accuracy to 0.625mg/l. For me this would be ridiculous as I would use a whole bottle of reagent to test around my KH of 11.5!, but when the water is so soft like yours, you have to increase the accuracy.

HTH


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post #8 of 9 (permalink) Old 03-06-2005, 10:13 AM Thread Starter
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OK, I think my KH is between 1 & 2, with a Ph of about 6,3 that should make my CO2 about 30ppm +/- 3-4. So if I put some crushed sea shells in my filter that will increase the KH, but the Ph will also increse, right? So I will actually be holding the CO2 levels steady?
And another thing, how much crushed sea shells should I use in a 210 ltr tank (55g)?
Thanks for the help.

Eheim pimp #127.
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post #9 of 9 (permalink) Old 03-06-2005, 03:10 PM Thread Starter
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I think IŽve found the solution, when changing water in the tank IŽll mix hot and cold water. The cold water is very soft (2-3 KH) while the hot water is hard (around 40 KH) IŽll see if I can find a nice balance there.
Until now IŽve never used hot water, always boiled the cold water since there are supposed to be more dissolved minerals in the hot water, maybe just what I need.

Eheim pimp #127.
600 ltr (160g) planted tank. Pressurized CO2, Eheim 2260 & Sacem Marathon 2000, 156W T5.
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