I agree that a good fuge is better. I have a wet/dry, and I am constantly having to clean slime and hair algae from my tank. when I start my 180, I'm going to have a large fuge. if you put macroalgae (like caulerpa) in a fuge, it will use up the nutrients needed for nuisance algae, therefore keeping the water in your main tank cleaner. by having a fuge separate from the main tank, pods will be able to multiply without the threat of predation. the only good thing I can say about a wet/dry is that it provides space to keep some of the equipment out of the main tank, but you could do this with a fuge also, so imo, the fuge is better.