I have Salifert tests for the PO4, NI3, Kh, Ca, Mg, Ph. When I test PO4 the color becomes a dark blue.Sorry to hear about the hammer, Apstasia and Peppermint. Wrasses like disappearing sometimes. I've known them to be gone for mostly weeks but sometimes months!
What are you using to test your PO4? Is there a nearby LFS that you could have test the water?




