Does anyone have experience to offer concerning this product?

As a matter of fact, I do:

http://www.fortunecity.com/lavender/.../881/carbo.htm

You have a tank as large as mine, with more light, so I suspect you need
compressed CO2. Compressed is also much cheaper, when you take into account
the cost of a Carbo-Plus block vs. the cost of a pressurized cylinder refill.


Leigh

http://www.fortunecity.com/lavender/halloween/881/