Orp reading 0

[Etienne 97]

My orp on my apex is reading 0 i have cleaned my prob yesterday and still decrasing i have put it into some rodi water and the reading have increase to around 30-35 everything look great great polyp extention on my birdnest stylophora all my lps are looking good and puffy

 

[Garf]

My orp on my apex is reading 0 i have cleaned my prob yesterday and still decrasing i have put it into some rodi water and the reading have increase to around 30-35 everything look great great polyp extention on my birdnest stylophora all my lps are looking good and puffy

I have no experience with ORP, but generally zeros are either testing error, or in the case of water production through Deionization, very good. :)