Quartz rock with Molybdenum ok?
 

I got some real nice rock from the local Molybdenum mine. White quarts with a 1/2" seam of moly. Any dangers to freshwater fish? barb's, Tetra's and swordtail?

Thx in advance

Well, the rock been in for a day, no sign of stress. Heres a pic of it

Neat piece of rock. No idea about the properties of molybdenum in FW though, but it sure looks neat. :)

Having said that though, I'm not sure I'd be comfortable with it in my tank. For me, I figure if I don't know for sure, it's safer to err on the side of caution.

Generally any matalic has strong potential to be bad in an aquarium!!! I would take it out if it were me...You might be ok in a freshwater tank, but I wouldn't take the chance.

You might be right. My older Tiger Barb, he never was as energetic, not ate much like the others, he Passed just after I took some pictures today. Rock is now removed. lets hope no more pass