Prob Bio S and -NP Pro

[biffobear50]

Been using these 2 products for a long time ...year or more .
Wasnt happy with the colours being produced with aquaforest tests so i am now trying salifert test.
Getting nitrates at around 50 .
I dont think im massively overstocked or overfeeding.
Also running a refugium with chaeto.
Could these products be affecting the test or could they actually not be working on my tank.
Tank looks fine btw but would like them down nearer 10 .

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[Aquaforest]

Hello,
Can you please post photos of your aquarium and filtration space/sump?

How much do you feed, how often, do you use any media?
How often do you do water changes? Do you have skimmer?

There is a lot reasons why nutrients are high. I am sure We will find solution for your high levels.