Injecting DIY CO2 into HOB intake with glass pipette - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-01-2008, 01:51 AM Thread Starter
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Lightbulb Injecting DIY CO2 into HOB intake with glass pipette

For all of you feeding your DIY CO2 into the intake tube of a HOB filter, here is a quick little device that makes it a bit better looking.

It starts with a glass Pasteur pipette. I used a short tipped one. They come also with a longer tip, which in turn, have a shorter body, useful for smaller filters. Any should cost about a quarter.



You bend the tip to desired angle, heating it gently with a lighter. Since the glass is so thin, heating it too much causes it to bend on its own weight, often sealing the tip.



I attached it to the intake tube with tiny rubber bands. There are clear ones, but I only had black at hand.





And then, installed.



Hope you find this useful.

Cheers.


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post #2 of 6 (permalink) Old 09-01-2008, 02:11 AM
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Although I despise the sound of bubbles chopping in an HOB, that's pretty creative.

I'd attach it to the intake with a few dots of Super Glue gel, would be a lot cleaner looking than the rubber bands.
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post #3 of 6 (permalink) Old 09-01-2008, 05:38 PM Thread Starter
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Yeah, the noise is bothersome. I only use this method on lesser tanks.

The clear rubber bands are practically invisible underwater. I didn't want to glue or silicone the glass tube to preserve the intake, I only have a couple, and a lot of pipettes for further experimental bending.


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post #4 of 6 (permalink) Old 09-09-2008, 03:59 AM
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Just curious how effective this is, because it seems like the water movement in the filter would release the co2 into the air.

Have you measured co2 levels with this method?
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post #5 of 6 (permalink) Old 09-09-2008, 05:41 AM Thread Starter
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Not too much. I use it in some 10G tanks, with moderate light. To maximize efficiency I removed the media basket in an AquaClear Mini (20), and use two sponges of the following model (30) stuffed snuggly. This keeps some bubbles trapped beneath them in the flow, some of them going through the sponge pores. I also fill the bottom of the filter with ceramic rings. Good dissolving chamber.

The unwanted surface agitation can be minimized. There's a certain water level at which the output disrupts less the surface. I also keep the flow reduced all the time, because the filter is still too much for a 10G.

I once withdrew a pH meter from the lab for a few days. Measures gave between 10-20ppm.

Plants grow well with 2x13W two pin CF bulbs with reflectors. However, I have to say, I once used 3x13w, with two of the bulbs on one side of the tank, and things didn't go so well, algae on the glass and on plants in the brighter side. I wouldn't say this is a good method for high light, but the previous config has worked very well on four tanks identically equipped. One more note, it seemed to work better in the 15G hex, assumably due to the lower surface-to-volume ratio.

Cheers, and welcome.


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post #6 of 6 (permalink) Old 09-09-2008, 12:50 PM
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Great, thanks! I've got a 4 gallon with a HOB and was kinda hoping to keep as few tubes in the tank as possible, might have to try this out.
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