Randy Holmes-Farley
Reef Chemist
View BadgesStaff member
Super Moderator
Excellence Award
Expert Contributor
Article Contributor
R2R Research
My Tank Thread
I'm testing .07 to .09 on a hanna checker. Which is up from the last time I tested copper on my display tank about a year ago at .02.
I have no idea if that accounts for anything but I figured I'd let you know.
I have no coral deaths. Everyone is happy.
The Hanna checker has been shown to be incorrect at those low levels, with icp tests detecting no copper.