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Re: Aquatic Plants Digest V3 #1362

Brian Gebbie at bgebbie at pcez_com wrote:

> Originally I placed my Eheim diffuser/reactor at the bottom near my canister
> intake.  I then read in Aqua Journal Vol. 33 that this specifically should
> not be done so I moved it to the bottom of the tank on the other side away
> from the canister intake.  Unfortunately, Aqua Journal did not give any
> reason for their recommendation so one can only speculate as to the validity
> of this suggestion.  Personally, I have not noticed much of a difference.
> The only reason I can think of for the recommendation would be that the
> return for the canister is near the top (at least in my tank) and the CO2
> should be injected near the bottom.  Since the article also suggests using a
> power head to increase circulation, I do not think the author is worried
> about the adverse effects of the circulation induced by the canister filter.
> In fact this statement seems to support my thought that the canister return
> may be to high to adequately circulate the C02 near the bottom.

Most canister returns create sufficient flow to distrubute the returned
water fairly evenly throughout the tank unless planted so dense that it
inhibits circulation, or the flow rate is too low to begin with. I'd guess
that there isn't any reason to worry about putting the diffusor under the
cannister intake. If the return directs the water across the surface and
produces turbulence, it won't matter either way since you'll lose more CO2

My CO2 goes directly into my canister intake. I have my canister return
positioned to send the water downward at an angle, reducing surface
turbulance and creating water currents throughout the height of the tank. I
like to change the direction from time to time to kick the mulm around.

Dan Dixon