Fat starfish

Hey everyone,

Need some help. I've been running Biopellets in a phosban reactor for a month now with no reduction in nitrates. Flow is strong in the reactor.

My parameters are:
Nitrate 25ppm salifert
phosphate 0.00ppm Hanna
Alk 8.0 Hanna
Calcium 430 Salifert
Nitrite 0 API
Ammonia 0 API
Mag 1350 Salifert

The tank is about 3 years old. Nitrates have always been around the 25ppm, I have good water flow, two MP40's, very ...