I have to say wet/dry filter will drive off some of the co2. This is the reason why I decided against the wet/dry filter. But I've also seen them in planted aquariums, where the plants seems to be growing well. May be the amount of co2 driven off isn't as much as expected?
If you already have a wet/dry filter, why not try it out? What do you have to lose, except for a cup of sugar and a pinch of yeast? Then you can tell us of your findings.
As suggested the constant, vigorous interaction between water and air that the wet/dry filter provides will drive off CO2. You can overcome this by simply adding more CO2 but I'd recommend a pressrized system for this to be effective, especially as your tank is 55G (if you don't have one already).
Another negative side to wed/dry filtration is the possible oxidation of some valuable nutrients.
Unless you intend to have a very heavily planted tank with lots of growth then your filtration should be fine, just keep an eye on your CO2 levels and try to keep them around a stable 20-35ppm.