Well the only reason you would not be seeing any readings on po4 or no2 is because the algae is consuming it and this negates any test readings.
But that is what algae feeds on, so it is best to try and alleviate the problems by sourcing the root of issue.
If you have not done so yet, you may...
40g tank drilled, stand and sump $100 obo
Ecoexotic panorama LED make offer
PC light 10k/actinic/moonlights make offer
Aquamedic calcium reactor KR400 BRAND NEW NEVER USED $75 OBO
ASM Mini G used for 2 weeks $50
Mag 7 $35
Mag 2 $20
Refractometer $20
miscellaneous chemicals and other crap free...
E... I have my 40b tank, stand, sump... I'll even throw in a skimmer and ecoxotic light. Cheap.
Moving out of NYC next week so it's gotta go.
LMK [email protected]
This will probably give you around 60g maybe... but hey it's free if you are interested..
The catch... like all things is... you need to pick it up.
I'm not going to hold it for anyone... first come first served.
Pick up... Corona NY.
If you do not know where it is... find yourself looking on...