Ok, I have a 29 gallon with 1 pl*co and 10 tiger barbs. I have a Fluval 204 and an Emperor 280. I added the Bio-Spira and fish according to the directions. The tank has been running for 2 weeks and I have a hint of ammonia no nitrites and NO nitrates. What is the deal? I have even added another 30 ml of the Bio-Spira and still nothing has changed. I have done weekly water changes of 10%. What is going on? Any ideas?