Copper

[CoralClasher]

I just made some new saltwater with RODI and 0 TDS. Used Hanna checker got 0.06 reading. Is that safe for my reef tank?

 

[EmdeReef]

It’s very likely a false positive but within the accuracy range of the checker.

 

[CoralClasher]

I don't think the checker is wrong my tank water is at 0.14. I don't run carbon just went and got some poly filter and Cuprisorb. Is a little copper good for the reef?

 

[CoralClasher]

This is the first time I checked for copper so I don't know if it's going up or not.

 

[Humblefish]

Copper is present in natural seawater, but at very low levels. Unless your corals/inverts are looking off, I wouldn’t worry about it.

 

[CoralClasher]

Sounds good I'll try to get my tank down to 0.06. I already put the poly filter in.