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I was questioning dinos myself. Don't even know where to begin if they are.Can you try the Hanna ULR Checker for phosphates and Salifert for nitrates, to crosscheck your API?
If your zeroed out, there could be some dinos in the mix.

I was questioning dinos myself. Don't even know where to begin if they are.



If you recently switched to RO/DI water, then most likely there some contaminants from your source water still within your tank.


