I've been doing a fish-in cycle since 1-20-13. Every 2-3 days I make a 40%-50% water change. Last weekend, I test my water on Saturday: 0ppm Ammonia, .50 Nitrite and 5.0 Nitrate. Sunday night I tested and it read 0ppm Ammonia, 0ppm Nitrite and 5.0 Nitrate. The past four days, it has read the...