Diffusing CO2 through Aquaclear HOB, have questions - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 02-14-2012, 03:50 AM Thread Starter
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Diffusing CO2 through Aquaclear HOB, have questions

I didn't know where to put this. I have seen that many people are running their CO2 into the hole in their Aquaclear HOB.

My main question is...How important is it that I actually put my tubing through the hole? Just by watching it, it seems like all the CO2 ends up at the bottom of the sponges. Do I even need to use the hole? Or can I just run my line to the bottom of the media basket. My reason for this is in my second question.

My second question...Where can I find a small enough diffusor/airstone to fit between the media basket and impeller? I have looked around and everything seems to big. I may try to find a chopstick, but that is about the only thing I can think of.

If I just run my line to an air stone under the media, will I be doing the same thing? I see the CO2 getting trapped in the sponges in the media and slowly creeping up. By the time it gets to the top, the bubbles are really small.

The only reason I would rather not use the hole in the impeller "hosing" is I cannot find anything that fits in, on top of it being a huge pain to prime. I have never used anything besides a glass diffusor thus far so I don't really know what to be aware of.

-Matt

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post #2 of 10 (permalink) Old 02-16-2012, 12:11 AM
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Are you using yeast CO2 or tank CO2?

Backpressure might not be enough if you're using yeast CO2, but this depends on bottle size, tank size and HOB gph.

Have you considered just investing in a Hagen Elite or other small pwrhead with venturi attachment for CO2?

A drop checker in a region of the tank where the growth/circulation is deficient could help you in evaluating dispersion method efficacy.
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post #3 of 10 (permalink) Old 02-16-2012, 07:40 AM Thread Starter
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DIY on this tank. I have a drop checker but not the proper fluid, turns out it was just basically PH solution (instructions call for tank water). I haven't been home to check this week so although it was green, not sure what that means until I get more 4 dKH water.

I actually found that some BBQ skewers I had laying around worked pretty good for a diffusor, kind of like the "chopstick method". I am able to fit that in to my AC filter.

I don't want to use a powerhead as this tank has no where to hide it. It would be between this or a glass diffisor. I don't mind the look of glass but this way uses my current filter (but a bit loud now that I have it in the intake).

I will test what I have when I am home for more than a few hours. I am not sure how my drop checker will react without the proper solution but it does change color (green ATM).

-Matt

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post #4 of 10 (permalink) Old 02-17-2012, 01:11 AM
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I have compressed co2 going into an aquaclear hob hole. I also took the sponge out.
Is it required? Prob not. I think the problem with an air stone under the sponge is it may not evenly distribute bubbles along the sponge. You may find yourself with one big bubble that obstructs flow and burps when it accumulates too much gas.
If you have a standard air hose just cut it at 30 degree angle and push it through, that's what I did. You'd have to watch out for back pressure, if a hose pops off the hob will pump water all over the floor. So put in a check valve. Second thing is if you have a a black out the gas accumulates and the hob doesn't pump without priming. Worse, it burns out from pumping air instead of water.
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post #5 of 10 (permalink) Old 02-17-2012, 12:32 PM
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I use a chopstick into my HOB intake. I take about a 3" piece and sharpen both ends in a pencil sharpener. I find it makes pretty fine bubbles that the HOB has no problem sucking up. Most of the time I don't even hear it. I use DIY co2, so I have to clean off the end once a week due to the fungus, which makes the bubbles bigger. When my pressurized system get here I am still going to use the chopstick an see how that works. I find the chopstick makes finer bubbles than my glass diffuser.
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post #6 of 10 (permalink) Old 02-17-2012, 01:07 PM
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There’s a good reason to inject the CO2 through the intake tube. It gives the impellor a chance to “chop up” the CO2 bubbles first, then the sponges can disburse it out of the filter. I am running DIY CO2 through aquaclear filters on several of my smaller tanks. And the drop checkers are a pale green. When the DC starts turning blue, I mix up a fresh batch of sugar/yeast mix.
Charles
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post #7 of 10 (permalink) Old 02-17-2012, 01:28 PM
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I had my DIY CO2 hooked up to my AquaClear's intake, but was told to remove it because the cascade of the water from the HOB got rid of the dissolved CO2.

Is that true? I have it hooked up to my powerhead now, but I'm looking to remove that soon.

-KC

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post #8 of 10 (permalink) Old 02-17-2012, 01:39 PM
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yes and no!!!! i just make sure my water level doesn't fall to much...no more than a 1/2", that way I don't get a lot of splash...My drop checker stays kinda of a lime color..almost yellow.
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post #9 of 10 (permalink) Old 02-17-2012, 02:20 PM
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Can someone take some photos of how and where the co2 goes on the aqua clear. I'm curious and want to give it a try.

Cheers
Alan

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post #10 of 10 (permalink) Old 02-17-2012, 11:02 PM
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my hob is like a waterfall, my plants grow fine, drop checker is green. I think this theory of water agitation releasing the CO2 is over cautious hogwash. if anything the waterfall makes the small bubbles of co2 fall deeper into my tank before rising to the surface.
i wouldn't worry about it.
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