Readin 0 Po4 but having to cleak glass daily

[OGKro]

So i've been struggling with my po4 level, because my salifert testkit has been reading 0 for a while now. I tested my second tank with the same test kit and it read Po4. Why can't i read the po4 in my first tank but i have to clean the glass daily ? My nitrates are between 5-10. I haven't had fish for 7 weeks because i had velvet. So what is the issue and how do i fix it ?

My other values are all fine:
KH 9.6
CA 460
MG 1400
No3 5-10
Po4 0.00 ?

My Lights are reefled 90 and run at 70 blue and 15 white

I have a skimmer but its turned off because i have no fish and struggle to keep po4 levels high enough

 

[anthonymckay]

Everyone has to clean their class daily... that's normal

 

[OGKro]

i know but i literally cleaned 30 minutes ago and it dirty again

 

[Cthulukelele]

i know but i literally cleaned 30 minutes ago and it dirty again

What does your glass look like

 

[OGKro]

Everyone has to clean their class daily... that's normal

I also dose 100 ml of phyto weekly

 

[TehBrainz]

i know but i literally cleaned 30 minutes ago and it dirty again

Don't mean this to sound like a jab (it's not!)

Did you clean the outside of the tank too? I've scraped the glass and come back like what the heck only to realize I forgot to clean the finger smudges from the mammals oogling at the fishies

 

[OGKro]

What does your glass look like

Hard to see but yeah thats not supposed to look this way after 30-40 minutes

 

[OGKro]

Don't mean this to sound like a jab (it's not!)

Did you clean the outside of the tank too? I've scraped the glass and come back like what the heck only to realize I forgot to clean the finger smudges from the mammals oogling at the fishies

No i cleaned it afterwards scraping

 

[Cthulukelele]

Hard to see but yeah thats not supposed to look this way after 30-40 minutes

To me this looks like a massive bacterial bloom. Is it a sort of whitish color? If you turn your skimmer on does the water quickly clear up from that cloudiness?

 

[OGKro]

To me this looks like a massive bacterial bloom. Is it a sort of whitish color? If you turn your skimmer on does the water quickly clear up from that cloudiness?

No when i scrape it, it's quite green. The skimmer doesn't do much. It foams for the first minutes and then stops

 

[twentyleagues]

What are you testing po4 with?

 

[OGKro]

What are you testing po4 with?

Salifert. I had 0 po4 with an old testkit i still had and i thought i should buy a new one but it also reads 0. So i'm dosing po4 from time to time