I have three bottles on my 75 gallon.

One bottle has airline tubing leading from the soda bottle to just inside
the filter intake. Using this method, 100% of the CO2 is absorbed
(resorbed?) by the time it comes out the filter outflow. I have had two
bottles hooked up to my canister filter before and had just a few bubbles
come all the way through - usually they'll build up inside and come out in a
sudden rush just when you least expect it. At any rate, I just use one
bottle there now. Depending on your filter model you might get a little
rattling noise, too.

The other two bottles I have leading into the bottom of UGF risers. The
bubbles rise up the tubes and get smashed by the impeller on powerheads
which results in very good, although not quite perfect, absorption.

I've never tried the airstone method myself. I understand you need to keep
an eye on the stone to see if it's getting gunked up. Maybe someone who
knows better can comment?

Note: before you do anything with the pH, wait a couple days after you set
up your CO2 and test again. The CO2 will lower your pH.

kush

"You can't have everything - where would you put it?"

SlimFlem wrote in message
om...
Thanks for all the advice and words of wisdom guys. I will take your
advice and use it. Kush, what is the best way for me to "inject" the
DIY CO2 bottles into my water? Should I use a simple airstone or run
a airtube into my filter intake or what?...or maybe a hard tube
suctioned to the inside glass that bubbles up??? What have you done
that works good? Thanks.

"kush" wrote in message
...
SlimFlem wrote ...

The statement about the plants is that the 6.5 PH will allow the plants
to
synthisize elements/minerals/etc.
better than at 7.5. How true this is, I'm not really sure.

Mmm, there is something about trace elements precipitating out, which I
think is related to total hardness, which is related to pH, but I'm not
clear on the chemistry myself. Any water chemistry geeks tuned into
this
thread?

... using SeaChem's Neutral Regulator with the Discus Buffer. These do
contain phospate buffers. Is this really a bad
thing?

This is a really, really bad thing for two reasons. First, you are
providing more phosphate than your plants can readily use, thereby
encouraging the proliferation of algae. Second, these products do not
persist in the aquarium - because your plants and algae are using them,
and
you're dumping them when you perform water changes - which means you
will be
perpetually adjusting your water chemistry and struggling to achieve and
maintain a desirable equilibrium.

... It sounds like you guys are thinking I am going to have an algea
breakout from these new lights.

Yes, we are; from the lights, the phosphates, and the lack of sufficient
CO2
(see below).

The LFS guys did say initally there might be a slight increase in water
algea, but it would go away after a few days since the plants will be
robbing it of nutrients.

This COULD be true, provided the plants have everything they need to
sustain
vigorous growth in the correct balance. Biologic growth is limited by
whatever factor is in least supply. If you are providing ample light
for
photosynthesis and abundant nutrients but the plants lack sufficient
CO2,
they will not repeat not grow. At the light levels you are proposing
(even
leaving aside the issue of the phosphates), supplementing with CO2 is
NOT
optional. With 4.5 watts per gallon and a nutrient-rich water stream, I
would start with a minimum of three soda bottles of DIY CO2. Maybe more.

Alternatively, I would get a signed and witnessed agreement from your
LFS to
clean your tank out for you after two months. Tee hee.

Regarding the variable lighting schedule, I would recommend against
that,
too. The goal you are shooting for is to achieve a stable, desirable
environment in your tank. The more factors you have to adjust, the
harder
that will be. I'd recommend a constant equatorial eleven hour day
(where
the first and last half hour of each day, the sun strikes the water at
such
an extreme angle that very little light penetrates more than a few
inches
into the water).

kush

"You can't have everything - where would you put it?"