So my nirite is almost at zero but it won't go down any more, what does that mean? Amino 0 Nirite .01-.25 Nitrate 20. I got a 10 gallon tank with 9 inverts, and three small gobbies. I got a 20 gallon fillter which I change the filter pad every weak and nano protein skimmer. 20,000k bulb. I do...