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Re: [APD] Bubbles?

I almost always get readings at night.  I'm not a morning person, so
having time before work rarely happens for me to take a look.  Generally
I get about 10ppm, which is just too low.  I've seen higher, but it
averages around there at ~2.5 bubbles/second averaged over 60 seconds. 
The reactor is an attempt to increase the efficiency of the system to
raise the ppm but also to cut down on my refilling.  My 10# tank has
been refilled twice since I got it over last summer, and from reports
that's just too often.  I'm such a newb at this, so seeing bubbles from
all the plants when the water was stagnant without any injected CO2 left
me to believe I was doing something wrong with my filter.  I hope the
result is something from the lights/pmdd and good water in the meantime.

I'd like to clear one thing though, I hadn't done a water change
recently.  It was last Wednesday after a trip.  I've had to expand the
schedule to 1.5wks instead of weekly, so the tank will get another this
weekend, but nothing close enough to this event to cause an effect from
aerated tap water (although that does happen every time I do changes).

**another note**
The ractor I built was with pc elbows, some fittings, etc to the pump
output.  I wrote recently about where I should put the reactor with no
response, so I went with this.  I used the vacuum tube I originally got
with my python system.  It might be too short?  We'll see...

On 2/3/2004, "S. Hieber" <shieber at yahoo_com> wrote:

>I think you'll find lots of counterexamples -- more than
>just my 30g and 150g at home. The bubble rate is much lower
>and there are now O2 or CO2 problems. The CO2 level is
>about 25 ppm.
>Scott H.
>--- Andrew Mitchell <andrewm at cse_unsw.edu.au> wrote:
>> On Tue, 2004-02-03 at 12:51, David Terrell wrote:
>> > Hi all,
>> >
>> > I was working on making a Co2 reactor for my compressed
>> CO2.  The
>> > project only partially failed, I'd like to reverse the
>> flow of water
>> > since at the moment the bubbles and water are going the
>> same direction.
>> >   Now, that's only part of the story...
>> >
>> > I've only had plants pearl oxygen in the past while
>> doing water changes,
>> > never on a regular basis.  Last night after noticing a
>> leak later in the
>> At a guess the water you are adding is from the tap and
>> contains a lot
>> of dissolved gasses. You may notice a similar effect if
>> you pour a glass
>> of water from the tap... I certainly do. Unfortunately
>> this does not
>> indicate a large CO2 production by plants.
>> > evening I just turned off my pump, in anticipation I
>> would fix it
>> > tonight.  I came home to find bubbles coming from just
>> about all my
>> > plants.  Not an impressive amount as I've seen
>> photographed, but more
>> > then I've ever seen my tank produce on their own.  It
>> made me curious,
>> > without the flow of water, without the compressed CO2,
>> now they're
>> > pearling?  What could possibly be wrong with my setup
>> (wet/dry trickle,
>> > 90g AGA overflow) that would cause the plants to seem
>> happier without
>> > the filtration + CO2?!
>> The perling is more related to concentration of O2 in the
>> immediate
>> vicinity of the plants' leaves rather than general health
>> of the plants.
>> Without the water flow you won't lose so much CO2 and O2
>> in your
>> overflow and wet/dry filter. In addition in an almost
>> stagnant tank
>> there isn't the water flow to take the high concentration
>> of O2 from the
>> area very close to the leaves to the rest of the tank, so
>> a high
>> concentration of O2 can easily build up there.
>> In general your plants are probably not perling because
>> of losses in the
>> filter (and overflow) of oxygen. If you have a body of
>> water that is
>> close to O2 saturation, and aerate it (e.g. wet/dry
>> filter and overflow)
>> then the concentration of O2 in the water will decrease.
>> In your case
>> the aeration is probably great enough such that the
>> plants can't quite
>> produce O2 fast enough. I wouldn't worry about it unless
>> your CO2 level
>> is too low or you are worried about your CO2 expenditure.
>> What are
>> (usually) your CO2 levels (am and pm) and average bubbles
>> per second?
>> ON a related topic...
>> I have thought about the concept of a general rule of
>> thumb for CO2
>> bubbles per second compared to CO2 levels etcetera...
>> what do the more
>> experienced aquatic gardeners think of it (see below)?
>> If you average less than 1 bubble per second per 70
>> gallons of water and
>> maintain "the optimum" CO2 level in your tank then you
>> probably have a
>> very low air/water interface rate and run the risk (with
>> medium density
>> planting and fish load) of running out of O2 overnight
>> and should
>> consider increasing this interface (e.g. spray bar more
>> elevated,
>> surface agitation, water flow near the surface, air pump
>> on a timer,
>> whatever). If you have over 1 bubbles per second per 30
>> gallons then you
>> should be very safe, even under high bioload. If you have
>> over 1 bubble
>> per second per 20 gallons then you can safely reduce your
>> surface
>> agitation (and save on CO2) or fix your reactor!
>> Of course this all depends on size of bubble, how
>> efficient your reactor
>> is, bioload, air pressure (height above sea level) and
>> probably several
>> other factors... but would it be a reasonable rule of
>> thumb? Do many
>> people use less than 1 bubble per second per 60 gallons
>> successfully
>> (with fish)? I haven't thought out the exact details of
>> the numbers.
>> _______________________________________________
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>S. Hieber
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