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Re: CO2 diffusers

I diffuse my CO2 two different ways. In my 55g, I run it into my Eheim
prefilter and then into an Eheim 2215. It works just fine, and this filter
has never locked. In the late evening about 1-2 hours before lights out, I
get some occasional burping. Subsequent to that, the only bubbles in my tank
are due to pearling.

In a 20g and 15g tank I input into separate Fluval 103 filters. these
filters do lock occasionally and it's a pain because they don't prime nearly
as easily as the Eheims so sometimes it takes a while to get them started

For my new 75g tank, I built an external reactor out of PVC pipe and
fittings. I neglected to take a picture of it before I stuck it behind the
tank and I haven't gotten up the energy yet to diagram it. Basically, it's
4" PVC, 18" long. I capped the bottom end and the top end I glued on a
threaded fitting, to which I inserted a threaded cap. I drilled holes in
both the permanent and threaded caps and glued 1/2" barbed hose fittings
into the holes. I filled the pipe with mini bioballs. It's powered via a
small powerhead I had, and to which I attached an old power filter strainer
and pipe. The CO2 line goes into this pipe and it serves as kind of a cheap
bubble counter. A hose goes from the powerhead to the bottom of the reactor,
and the hose from the top goes back into the tank. It must be pretty
efficient because by the time the water returns to the tank there are
absolutely no bubbles...ever. Cost wasn't too bad, but I already had a
powerhead, bioballs and the necessary 1/2" hose. I spent a total of $18.00
more or less on PVC stuff, and I've still got another 6-1/2 feet of PVC
pipe. Not counting the trip to Home Depot, it took me less than an hour to

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