API Freshwater Test

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My fish look and seem healthy except for one who isnt eating. I dont see anything wrong w it. Does that mean my levels are 0? Or do I still need to check?
 
You need to test. Ammonia and nitrites should be 0 and nitrates should have a reading of more than 0 in a cycled tank. When the nitrates hit 20 ppm do a 50% water change
 
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