Is it possible to have ammonia at 0 and still have diatoms on sand bed and rock.


Reefing newb
I have been testing my tank every 2 days I know this is a little much. I keep noticing diatoms on sand bed, rock, and glass. My test kit reads Ammonia 0 Nitrites 0 Nitrates 40 ppm thats driving me crazy but I'm going to do a 40% water change tm and hopefully get that 20 or below. I thought diatoms were only in your tanks when ammonia was present? Can you have ammonia when nitrites are at 0?
Yes. Diatoms feed off of silicates in your system. They will die out in time once those are used up. Provided you don't add any more silicates during water changes.