Hey guys, my tank has been up and running for about a month now and i finished my first cycle. My PH is at 8.2, my nitrite is at 0 mg/L my ammonia is at 0 mg/L, but my nitrate is at 20 mg/L. I tested my tap water and the nitrate in that is at 20 mg/L.. So would i need to use distilled water with...