Tropical Fish Keeping - Aquarium fish care and resources

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PedrosPinnacle 12-14-2009 10:59 PM

C02 Diffusion
For those of you that use C02 injection in your planted aquariums, is there an effective way to diffuse C02 in an aquarium without using a reactor?

I have two HOB filters. If I connected the tubing from the C02 regulator to the intake of a HOB filter, would that effectively dissolve the C02? Obviously I'm looking to waste as little as possible.


WisFish 12-15-2009 08:25 AM

I've only heard of people using this method with Cannister filters. I don't thnk this would work that well with a HOB filter because the CO2 would disipate into the air as soon as the CO2 reached the top of the intake tube.

Hawkian 12-15-2009 10:00 AM

If I understand your question correctly there is a way to inject CO2 in your tank without having to buy expensive equipment. Now, I don't use CO2 in my tank and I've never done this myself but check it out, it may be what you're looking for?

Doing a search on youtube for "CO2 injection aquarium" or something like that will also return some interesting results of various DIY reactor prototypes.

Good luck!

PedrosPinnacle 12-15-2009 09:02 PM

Well the C02 bubble would go up through the intake tube, then the tube goes laterally 2 inches and then goes back down and hits the motor before being forced through the filter media and back into the aquarium. Wouldn't this give the c02 plenty of time to diffuse before it hits the aquarium water?

Angel079 12-15-2009 09:09 PM

I'd not hook up up this way if I was going for CO2 simply because this drives it out of your tank pretty quick and then that's no real point in using it at all.
What issues do you have that makes you need CO2 if I may ask?

Hawkian 12-15-2009 09:21 PM

K. I misunderstood your question... sorry. Going to bed now..

Mikaila31 12-15-2009 11:54 PM

The action of the HOB filter will drive any CO2 back out of the water. You don't want surface mixing/ major movement in a planted tank, especially with CO2 injection. IMO you need to look into a internal or canister before bothering with DIY CO2. HOBs and CO2 don't mix.

As far as cheap diffusers. Injecting it via CO2 tubing into the filter intake works. There are also lots of cheap ceramic/glass co2 diffusers on ebay, usually from singapore and china. Thats where I get mine. Get a few, cuz you will break them.

PedrosPinnacle 12-16-2009 08:25 AM

Thanks. I'll look for some diffusers. I had a cannister filter but one day the outbound hose popped out for no reason and sprayed about five gallons of water all over the place. If I wasn't at home, it would have drained the entire aquarium. So for my peace of mind, I do not use them anymore. I have the complete c02 system from However, the reactor basically needs to be hooked up to a cannister filter. I modified the system using a powerhead to pump water through the reactor but there are still leaks in the piping (despite thread-taping the heck out of everything). I have also read that a reactor like the one I have is not totally necessary. I think a diffuser is the answer I'm looking for.

Mikaila31 12-16-2009 02:39 PM

Didn't you have hose claps on the canister? That shouldn't of happened. If its older, you may want to replace the hoses. If it doesn't have hose clamps you can buy some thing similar at the hardware store.

If you are running CO2 you should have a drop checker too. These you can also get on ebay, usually from the same seller as the diffuser. If you chose to run it with the HOB, you will really need to step up the BPS. To compete with the removal of CO2 by the HOB. Issue with this is if the HOB stops working you risk gassing the fish.

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