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[APD] Re: Aquatic-Plants Digest, Vol 15, Issue 34

Hi RJ,

I'll jump in again to say that I think that more power in a reactor is not a good thing. Mixing is best done by holding the two things together and making them rotate. Faster flow and crashing against resistance works, but not nearly as well, and the effectiveness will decrease with greater flow, not increase.

The Plant guild reactor uses only a Rio50, the bubbles gently roll around until they are gone. I use, in my DIY copy of that design, a Rio90 and depending on the sort of sponge or kitchen scrubbie I use on the end of the cylinder, I may get bubbles collected in the scrubbie or sponge or blown out the end of the tube (which is a bit shorter than it ought to be). I suspect that the use of a powerhead in reactors came about because that was what people had laying about, not because it was best suited to the job.

IMHO, a fishkeping novice with an engineering background, a slower flowing pump with a longer tube than mine (at 5") could allow you to churn the bubbles and use no sponge at all on the end, so visually, the unit would be even less to contend with. Offset the water inlet, for maximum rolling, and it ought to work pretty good. I'd do mine again, but it works OK now.

Did you ever address the thing I mentioned about the intake grid facing downward allowing the airlock when gas collects?


Message: 11
Date: Wed, 17 Nov 2004 14:24:10 -0600
From: "RJ Skall" <rjskall2 at hotmail_com>
Subject: [APD] RE: Setbacks Injecting co2 - need help
To: aquatic-plants at actwin_com

Bob Alston and S. Hieber, thanks for the replies. Questions: do you folks
also have this large gap of gas in the reactor body during normal operation?
Also, how far up from the bottom of the tank does your reactor sit for best
What I still can't understand is that the rio powerhead I am using is even
the next model up (more gph) than the Vortex models like the ones you got
from floridadriftwood.com. The cylinder body dimensions and open cell foam
piece at the bottom are the same as well. I am running 1.5 to 2 bubbles/sec.
Last night I checked the intake of the powerhead - it wasn't clogged. But
the pH doesn't seem to be decreasing, so between that and the BBA and the
non-pearling, I don't think the plants are benefitting. I still wonder what
I could be doing wrong. Thanks again.

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