I bought a 30 gal. tank about 6 months ago and i set it up, i let it run for a few months checking the levels of everything weekly and i let it run and just not i tested all the things and the ph is 7.4 , the nitrate and nitrite are 0, what does this mean, and the amonia is a very clear yellow , i dont have the card so i dont know what that means.
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