If you're using LR and a skimmer (or even without a skimmer), a wet/dry will cause more problems than not. It will be great for nitrification of ammonia to nitrate, but you will likely overload the ability of your LR to complete the denitrification process, so you'll just see your nitrates rise and be completely dependent on water changes to keep levels down. It's the same reason bio balls are not recommended on reefs which have LR. For a fish only tank, a wet/dry can work as there are insufficient areas for nitrifying bacteria to colonize (also, the wet/dry maintains a high oxygen environment that nitrifying bacteria thrive on to process waste).
Stay with your LR and skimmer, and avoid the wet/dry, which will defeat the balanced system you're paying for. LR is not cheap, so you might as well use it as its intended to be used, as your bio filter.
Yes, you still do need to do water changes, but it will be a lot easier to keep your nitrates in line (along with all the other DOCs' in your system water).
Henry
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