Yah, the wet dry isnt really needed anymore. Apparently they are useful for fish only situations, but if you want to keep corals and inverts, just spend your money on a powerful skimmer.
I have an aquaC 180 ev. Cost a bundle, but pulls out 500ml of skimmate every two days so I am happy. I have it running on a 120 gallon tank with a 75 gallon sump.
HTH
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