Filter and CO2 - Equipment

Kamon · 11-04-2009, 09:10 PM

I have an AquaClear HOB filter on my 29gal that I've been using for nearly eight months. The filter works well, but its been posted on APC and other forums that HOB filters can lower the level of CO2 in a tank. Water level in my aquarium is level with the filter to reduce this effect. Canister filters sound much better, but I'm a bit short on cash atm. Any cheap canisters out there (DIY works as well)?

DIY yeast CO2 is decent at best. I'd rather have a pressurized system. A paintball CO2 tank sounds affordable. I have no experience with pressurized CO2, so a good explanation of what all I would need (while keeping things cheap) would be great.

Thanks for reading.

Seattle_Aquarist · 11-04-2009, 09:57 PM

Hi Kamon,

In one of my tanks I kept my Aquaclear HOB filter and when I could afford it I bought the pressurized CO2. With the pressurized system I continue to feed my CO2 into the input of the Aquaclear, it works just great!

Kamon · 11-04-2009, 10:39 PM

Input of the filter? I'm not sure if I know what that means...

oakleyhoma · 11-05-2009, 04:58 AM

perhaps it means into the return part of the chamber?

Seattle_Aquarist · 11-05-2009, 07:14 AM

Hi Kamon,

oakleyhoma is correct, I run the tubing from my CO2 (DIY 0r pressurized) down the input tube of the Aquaclear filter and put the end in the strainer. I hold the CO2 tubing in place with rubber bands. The bubbles are sucked up the filter input tube, hit the filter impeller and are broken into microbubbles which flow into the filter chamber. The microbubbles get caught in the sponge filter material and dissolve as the water flows past. It may not be as efficient as a CO2 reactor, but it works very well.

leolucido · 11-05-2009, 08:50 AM

They say go with what you can afford. In this hobby however it's always best to buy the best you can really afford.

HOB filters do the job but you're better off with canister filters in the long run, maintenance wise and return of investment.

On CO2, the paintball cylinders actually end up costing you more due to frequent refills to the store. I would take my time if I were you until you find a good deal for a complete CO2 system.

Kamon · 11-05-2009, 09:48 PM

Thanks for the replies!

I'll take your advice and wait for a complete CO2 system. I'd still like to find a somewhat affordable one. And recommendations?

I believe I understand what you are trying to say, Seattle. I would run the tubing along the outside of the input tube of the filter to the very end of the strainer (or sucker-thing). I am currently running tubing from my DIY bottle into a glass diffuser to spread the bubbles around the tank.

Seattle_Aquarist · 11-06-2009, 08:02 AM

Hi Kamon,

You got the idea! What I like is the CO2 rich water flows out of the filter and flows throughout the aquarium with current from the filter.

Kamon · 11-06-2009, 06:31 PM

Seattle: I'm sure your method is much better than what I'm currently using. Thanks for the advice you've given me.

I'm trying to find a 5lb CO2 cylinder on ebay for a reasonable price. Can I use any 5lb cylinder? Or does it have to be a certain kind?

The reason I ask is because I've read that some regulators are different sizes.

Seattle_Aquarist · 11-06-2009, 08:08 PM

Hi Kamon,

If the cylinder (tank) is for CO2, it should be fine. They are usually available in aluminum or steel. If it is used, and has not been hydrostatically tested in the last five years, it may cost you $25 to have it tested before it can be filled. A new 5# costs about $60 plus freight.