I'd personally avoid both of them. Though stainless is mostly iron ,some of it contains nickel and trace amounts of other harmful metals. Brass is worse. Miniscule amounts of free copper will destroy invertebrates.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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