Gas flow rate - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-10-2006, 05:28 PM Thread Starter
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Gas flow rate

Afternoon all

I've just rigged up a DIY Co2 reactor, it consists of the gas line fed through a DIY bubble counter, and directly into the impellor of a very small pump mounted near the bottom of the tank.

could anyone give me a rough ballpark figure on the sort of bubble rate I should be starting with? I just don't want to harm the fish while I'm waiting for everything to come to equalibrium.

I'll obviously test for Co2, but I'm a complete newb at this and as I say I'm worried about harming the fish.

How quickly will the co2 level rise when I turn on the gas?

The tanks 300l, lit by 4 * 38W T5's

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Chris
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post #2 of 6 (permalink) Old 09-10-2006, 05:34 PM
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Hey Chris, I highly doubt the DIY CO2 will hurt your fish - it just doesn't put out enough. Your 300 liter tank is about 80 US gallons. For a tank this size, you'll most likely need another DIY CO2 bottle (or two). I get about 1 bubble per second for the first 2 weeks of my DIY CO2, and then about 1 bubble per 2 or 3 seconds the week after that, on a 15 gallon - and it is barely enough to keep the plants happy. I use an internal fluval to break up my bubbles, similar to how you do it. It seems to work pretty well, and the fish have never seemed stressed from it. I have a feeling that after a few months of DIY CO2 you're going to want to start investigating compressed. It really isn't as tough and intimidating as it sounds, and much easier. Once you get it set up you can forget about it for a year or so!


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post #3 of 6 (permalink) Old 09-10-2006, 08:34 PM Thread Starter
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Originally Posted by JenThePlantGeek View Post
Hey Chris, I highly doubt the DIY CO2 will hurt your fish - it just doesn't put out enough. Your 300 liter tank is about 80 US gallons. For a tank this size, you'll most likely need another DIY CO2 bottle (or two). I get about 1 bubble per second for the first 2 weeks of my DIY CO2, and then about 1 bubble per 2 or 3 seconds the week after that, on a 15 gallon - and it is barely enough to keep the plants happy. I use an internal fluval to break up my bubbles, similar to how you do it. It seems to work pretty well, and the fish have never seemed stressed from it. I have a feeling that after a few months of DIY CO2 you're going to want to start investigating compressed. It really isn't as tough and intimidating as it sounds, and much easier. Once you get it set up you can forget about it for a year or so!

Thanks for that that's eased my mind. I had visions of the fish going belly up withing the first minute

It is actually a compressed gas cylinder that i'm running off, it's just the "reactor" which is DIY


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Chris
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post #4 of 6 (permalink) Old 09-10-2006, 08:42 PM
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To get the right level for the compressed, use your needle valve to slowly slowly slowly turn it up over the course of a couple weeks. When you see your fish gasping, turn it back down a little until they seem ok. If you do it slowly and keep your eye on the fish (especially first thing in the morning) this won't hurt anything. You want to aim for as much CO2 as you can possibly get without causing harm to your fish, 30ppm is a good rule of thumb. Good luck!


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post #5 of 6 (permalink) Old 09-10-2006, 09:16 PM Thread Starter
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Thank you

much appreciated


Cheers

Chris
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post #6 of 6 (permalink) Old 09-11-2006, 03:52 AM
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I suggest you start the bubble rate at about 3 bubbles per second. I run my CO2 thru a powerhead for a 29 gallon tank and use around 3-4 bubbles per second, with no problems. That isn't a really efficient way to get CO2 into the water, but the mist of CO2 bubbles really helps the plants. To keep BBA under control we need to actually have 20 or so ppm of CO2 dissolved into the water, regardless of how much CO2 mist we blow around the tank. (Based on my experience.)

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