I am cycling a 13.5 Evo tank with Fritz Turbo Start and a shrimp. On day 10, the kit (API Saltwater) showed between 0-0.25 ppm, nitrites at 0.5 ppm, and nitrate at 40 ppm. Today, day 13, ammonia seemed to go back up to 0.5, while nitrite dropped to 0 and nitrate at 20 ppm. Is this normal? That ammonia would go back up? Any suggestions?