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Thanks to the folks who posted. Special mention to Alextal who suggested Linde Gas.
Just for future reference, I ended up going to Linde Gas on Vassar Street in Cambridge (by the MIT campus). They charge $120 for the tank (20 lbs) and $24.91 for refill (20 lbs).

I guess that buys me some time, ultimately I still need to find out where to refill/exchange.
What size are the full ones, how much?
Jul

I wondered where people in the Boston/Cambridge area get their CO2 cylinders (5-20 lbs)? I imagine prices must vary, refill-exchange, etc, I'm curious to compare people's experience. Also, saves me the hassle of calling around, ah, ah.
Thanks.

Jul

Great stuff. Thanks a lot.
Regards,

Jul

The unclear sentence that got lost in the previous post was:
"but a rise in pH once a week with your water change (tap water with no pH and bicarb added with have a significant effect) really isn’t a big deal."
Sorry about that.
Jul

<You> Quite perceptive there Abby, I do have a PhD in chemistry. Which does not mean that I want to fool around with water chemistry, just keep fish alive and maybe in the future keep some healthy plants. Anyway, these were some very helpful comments, and right to the point, thank you. A few questio...

Thanks, Ned. I guess I was hoping to avoid having to invest in a CO2 system, but that's what seems to make sense with regard to water chemistry and plant health. With my KH of 2 and no phosphates, roughly 15 ppm of CO2 is what it takes to get a pH of 6.6, which is good for both plants and fish. It d...

Believe me, I only settled for buffers because my pH 9, KH 2 water would settle at about 8.2 in the tank, which was just too high, and too many fish died, despite otherwise perfects stats, regular water change, etc. (great for my cichlid tank though). The phosphates that come from fish food, water s...

Hello, I very much enjoyed Ned’s detailed suggestions for switching to a planted tank (last post 06/06/06). Thanks Ned. I have additional questions about the water issue. MWRA aims for a pH of 9.1 with an alkalinity of 40 mg/L, and the GH of the supply is naturally <1 (MWRA claim 7 ppm at the source...

Hey Ned, I got my cichlid tank started last Saturday and introduced six juveniles I got from you: 1 yellow lab, 1 mbamba yellow top, 1 lemon peacock, 1 phenochilus, 1 VC10 (my favorite) and 1 ahli. Before I get to the point, I'm confused about the ahli. Haplochromis ahli are the same as sciaenochrom...