Low or zero phos high nitrates above 75.

robinmprn

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I have a 55 gallon tank with a 20 gallon sump 2 clowns, 2 cardinals, a wrasse and a goby. Several clean up crew. My issue is that I have zero or very low phos and high nitrate reading 75 on the Hannah reader I have been vinegar dosing and doing water changes wondering if my issue is actually no phosphates. Any suggestions what I can do to regulate chemistry. Currently running a octo skimmer on the system
 

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Carbon dosing needs some bit of phosphate to work. You can dose phosphate or feed something with a lot of phosphates
 
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00W

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Try some water changes to get nitrates a bit more manageable.
Regular fish food seems to raise phosphate more than nitrate for me anyways so you can try that too.
 
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Jekyl

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Welcome to R2R.

I believe that if phosphate is limited then dosing won't effect nitrate.

Better action would be to complete water changes until you reach desired levels. 30% at a time, 2 times a week.

From there chaeto in the sump can be used to maintain levels.
 
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