Seems like it takes a while sometimes to balance out. My frag tank is only about 19g but I have another 40 g of water or so in my sump. I only have two clown fish in this system and for months I couldn't get the no3 below 10 which is pretty crazy considering I have only 2 fish. I started dosing vinegar and got it down to 0 after 4 to 5 weeks. Now I'm trying to raise the no3 because it's dead 0 , like no pink at all on a Salifert test , and since my FT is mostly acans and zoas I don't like them that low. I dropped the vinegar down to less than 5 ml per day and started feeding heavier and more aminos and it still didn't help , so for now I've stopped dosing vinegar completely and I'll see if I can maintain levels where I want now.
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