0 nitrates

[Joe.Reef805]

So I tested my water because my chaeto hasn’t been growing since I first added it when my cycle was complete. I tested 0 Nitrate and 0.25 phosphate. Shouldn’t my nitrate not be at 0 since my phosphate is at .25? It’s a 25g with 5 small fish. Feed 2x a day

 

[Flux Capacitor]

It’s possible to have zero nitrates and high phosphates. Do you do water changes? What’s your filtration like?