Im not sure if this is where this belongs, but here goes. I've read everywhere that copper is fatal for cephs. Is this true for all metals? The reason I ask is that I have just learned (by the mouth of my Chemistry instructor, not an official, scholarly source) that the waterway I have collected all my live food from has been contaminaed with heavy amounts of lead, possibly leading to numorous stillborn manatees in this area, for the past few decades. I have been feeding cuttlefish hatchlings with live shore shrimp from this water source for just over a month now. The cuttles I have been raising are in excellent health condition (to the eye). I have had a 100% survival rate with incredible growth rates. If there is lead in the water (and passed on to the shore shrimp), what would be the effects on the cuttlefish? Death? I have witnessed no ill effects so far. Is it possible that some trace metals enhance the health of cephs? It is most probable, in my opinion, that I received false information about the lead contents in the water (as I expect there would be ill effects from lead), but regardless of my situation, I am still curious as to the effects of any metal on cephs, and why this effect takes place.