A lot of what I have read, is contrary to the above posts. If brass and or bronze is used, it is considered harmless as leaching should not occur at the Ph levels a saltwater tank is kept at. If the ph was allowed to drop into the region of the ph range that it wold cause leaching, the metal itself would not be the real problem anyhow and odds are most critters would already be toast. I still do not use any metals except for some stainless and titanium items.