It would interesting to see what bacteria is causing this. I know they have the Aquabiomics tests, but I am not sure how accurate it is and if they employ strict collection and transportation procedures as they may affect test results. My thought is do a water change, change out mechanical...
Phosphorus dropped to 147 ppb (0.451 ppm Phos) from > 200 ppb after decreasing feedings on the auto fish feeder and skimming more wet. Nitrate 5.6. Gonna slightly increase the NH4 dosing.
Just did some chemistry testing.
1/4/26
Alk 7.9
Nitrate 6.5
Phosphorus > 200 ppb (greater than analytical measuring range). I measured twice to rule out random error.
was 20 ppb on 12/16/25
Recently, I was feeding heavy and dosing NH4 to increase my nutrients. I also added some dead rock...
Bicarbonate in a 20g/L solution to about a 200g system volume tank. I started at 8mL/day and my nitrates went from 0 to 0.4 in about 1.5 weeks. I increased it to 10 mL/day recently. I’ll check next week and will increase it more. Perhaps my goal is 6-10 since my phos is around 0.06.
I started dosing NH4 as well since my nitrates have always been undetectable. My corals have responded well and have been gaining their color back over 2 weeks.