coppered rocks??

[bomber]

Hi guys...recently encounter with some problem..i have this tank for around 2 to 3months and all my lps and zoas not open for weeks..my parameter is ok...i added snails and urchin in my tank, all died except for fishes...im using rodi and my rock is from my pervious tank..i was wondering is my tank contain copper and what Is the source of it

[xiggie]

Check salinity ,

[bomber]

Thanks for replying...I just brought a salifert copper testkit and the result is zero..my refractometer state 1.025..inside the gauge, the is a 20 degree icon...do anyone know what does that mean?

[xiggie]

Calibrate refractometer with ro/di water ,should read 1.000 . If snail ,urchin or shrimps die as soon as introduced to tank is a sign of too high or too low salinity. Could be some other stuff but no harm checking .