Some DIY CO2 questions.

backflipfronflip

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With the addition of a new light on my 40G breeder i have noticed hair Algae growing on the plants. Am i right in thinking this is likely due to a lack of CO2?

I am looking at DIY CO2 for my 40G breeder, will probably switch to injected in the future due to ease i think, but in the mean time i have a couple of questions I'm hoping you could help with.

How do you stop the CO2 being pumped into the tank at night?

For a 40G breeder could i use a single 2litre bottle or is 2 going to be better?

As a form of diffusion i was thinking about putting the CO2 hose into the intake tube of my Canister filter, would that work?

I have a dirt based tank, it was supposed to be a low tech tank but now i have a new light fitting it looks like i am going to higher tech with CO2. With the dirt bottom will i still need to fertilize?

Thanks in advance.
 

Mer-max

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You run an air stone at night, or like me - move your spray bar up to turn the water more. You don't turn off your co2. I've heard of the canister intake idea before but on my 20long I just crammed cotton from a dog toy into the line and then put a small air stone on. On my 55 I use a diffuser.


I don't know about your dirt bottom.

What kind of lights do you have?
 

Mer-max

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I use two 2 liter bottles with a table spoon of yeast and two cups of sugar on the 55. On my 20long I use 1 one liter with the same recipe
 

escapay

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With my 36 gallon, I use 2 2-liter bottles. I think I need to play with the recipe and maybe even add more CO2 since my CO2 is not high enough.

Other parts have been answered. I don't know the dirt answer.
 

Mer-max

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With my 36 gallon, I use 2 2-liter bottles. I think I need to play with the recipe and maybe even add more CO2 since my CO2 is not high enough.

Other parts have been answered. I don't know the dirt answer.
How are you measuring co2?
 
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backflipfronflip

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So to keep an even influx of CO2 can i start with one 2 ltr bottle and then add another in a week? This way they will always be a week apart when i replace them to keep the CO2 production even?
 

Mer-max

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It only takes a min to change them. I marked one 1 and the other 2. I pulled one a week later and redid it, then the next week I did the other. Been working ok but I think for a 55 I still need more co2. I got my regulator today and will get the bottle next week so on my 55 I won't have to deal with it anymore
 

Mer-max

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Here's my understanding - a full 1.0 drop in ph equals 30ppm co2 - meaning if your ph without co2 is 7.0 and you add until you reach 6.0 you have 30ppm.

The ph kh calculations don't account other buffers in your water
 
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backflipfronflip

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For this you need you need the CO2 free example, so if you have CO2 already running this will be difficult to test?
 

Mer-max

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Right. You could take some water from where ever you get it - tap, ro, spring, well - let it sit in covered for a day and then measure the ph. Aim for 1.0 lower than that when you add co2
 
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