Can pest algae cause low no3 and po4?

Biff0rz

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Tested my water tonight and -
No3: 1ppm (maybe 1/2, it barely looks like 1ppm but def not 0) (nyos)
Po4: 0.05 (Hanna ulr)

Nitrates have been at 5-10 consistently until today (weekly testing). I've got a lot of gha and cyano growing in the tank (uglies). I've read that those can cause po4 to drop or read incorrectly, is the same for no3? I'm concerned it's so low. One thing to note is tonight I took a powerhead and blew off all the cyano from the rocks and sand. My roller filter picked all of it up out of the water column. I would have thought messing with the substrate and blowing rocks off would have raised nitrates if anything.

As far as feeding goes I feed nori every other day (tangs, lots o poop) and mysis 2x/day. I feed about 3 cubes each feeding.

I'm doing mostly dry skimming. It runs 24x7.

I do awc and it adds up to approx 6% a week.
 
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Biff0rz

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