API Test Results Not Changing?

[FishyThings]

Every time I test my Phos levels they stay at 0.25 ppm. I have made a DIY protein skimmer that almost worked too well, and completely filled the collection cup in 3 days. Now I am running Aqueon Phosphate remover pads in my hob filters, and still no change. This is very confusing. The test used to change when I first set up my nano around a year ago, but when I first setup my 30g they stopped changing. It doesnt even change after a water change. Also keep in mind I have VERY heavy filtration

 

[Flippers4pups]

I would try a different P04 test kit like a Hannah ULR. More accurate test.

 

[FishyThings]

I would try a different P04 test kit like a Hannah ULR. More accurate test.

ok yeah thats what Im definetly going to do

 

[Flippers4pups]

Yes, API is fine to get started with, but as with their ammonia test kits, they don't do very well at low range.