Just curious if anyone has had any issues with the Salifert Phosphate test kit accuracy lately? My tank has been running for 1 year+ and during that time I have tested PO4 with the Salifert kit. PO4 has never been detected. So I increased feeding, took off socks, skimmed only at night, etc, trying to raise nutrients. Still PO4 was undetected with the Salifert kit. I started seeing some unwanted algaes growing in my display despite a ball of chaeto in my sump the size of a basketball. So I purchased a Hanna PO4 ulr checker and to my surprise PO4 read .23 ppm! The Salifert kit reads 0.Wondering if anyone else has had issues with Salifert Po4 kit? Maybe my kit is bunk?