:roll: Again the topic of using a wetdry with reef, I have used wetdry's for years with all my reef setup's. Yes they do produce Nitrate, and they do it quite well, that is their job. The breakdown of Ammonia and Nitrite to Nitrate, here is where the DSB or (deep sand bed) comes into play.
The Nitrate if used properly, will benefit corals and clams, the symbiotic algae in corals and clams use the Nitrate as fertilizer, this is when you get explosive growth. By using the DSB to keep the Nitrate levels low, but at a constant supply you are always feeding the corals and clams.
Clams need a constant supply of organic Nitrogen, due to the number of symbiotic algae in their mantle (10 times the algae than corals).
A research study done by Carmen Belda show the dramatic growth of clams that were given elevated Nitrate/Nitrogen. This is in Daniel Knops book on Giant Clams. With my systems I use wetdry, protein skimming, Hydro Carbon and DSB,and never ran into any problems using the bio media in the filter.
To have a successful reef tank you need to cover many factors, the wetdry filter should not be frowned on because of Nitrate production. Nitrate production that is maintained at low levels benefits the entire reef setup.

CaptiveReef