In article .com,
says...
Hello, it's me again with more questions! Thank you so much for your
help and advice so far -- this is the most open and friendly newsgroup
I've ever participated in. =)

This weekend I'm going to set up major CO2 injection for my new
tank--55 gallons, planted. It was going to be partially planted but
now I think the fake plants look horrible compared to the real thing.

Some of the plants have brown leaves already, though, and since they
have fertilizer and ~3 watts/gallon of full spectrum light, CO2's the
only deficiency I can think of (per this newsgroup's advice).

I think I can make a fairly aesthetic DIY kit, but I could buy two
Jungle Fizz Factories (supposed to be good up to 40 gallons) instead.
More aesthetic, more expensive.

Does anyone have experience or opinions on this?

I only have experience with CO2 from cylinders, not DIY. Many people have good
success with DYI systems and Excel. For lowest maintenance, and good long-term
value, a cylinder is an attractive option. If you would consider something in the
$100-150 range then here is how it breaks down:

1) Milwaukee regulator with bubble counter and needle valve and solenoid (plug in
24/7 for now) $69 new on eBay, or opt for a used one if available.

2) Used 5 or 10 pound CO2 cylinder from soda fountain, beer "kegerator", welding,
or other aquarist. $25-50. Aluminum is nice looking and a little lighter. Cost is
$10-20 to get filled if necessary. Check with local welding/industrial gas
supplier, or fire extinguisher recharge place. The former also sells such
cylinders but closer to $100.

3) Nylon gasket that fits between regulator and cylinder. Usually included with
regulator. Often free for the asking at an industrial gas supplier.

4) Hagen bubble ladder, $10.

5) One-way check valve in-line between bubble ladder and needle valve. Hagen or
tetra, about $1.50. Not strictly necessary, but useful to prevent siphoning water
out of aquarium while working on plumbing.

No need to overpay for special tubing. Simple aquarium airline, either clear vinyl
or silicone is adequate. Maybe you put in some new tubing once a year.

Geo.