Your tank still needs to cycle, and you can do it a lot easier by throwing in an ammonia source that's not alive! Check out this article...
... and use a cocktail shrimp, or even fish food. After 3-4 days you should see your ammonia levels start to rise, followed in a few weeks by your nitrite levels. As the nitrite levels rise, your ammonia levels will drop off. Eventually, after 4-6 weeks, your ammonia and nitrite levels will be at zero, and you should have some measurable nitrates in your tank. After a couple 30% water changes to bring the nitrate levels down as low as you can, then your tank is cycled.
It's much easier (for both you AND the fish!) to use the "fishless" method of cycling as you can just let the cycle run its natural course. When people cycle with fish, the extra water changes and additional chemicals they may use only prolong the cycle, cost more money, and in the end the fish may die from ammonia poisoning anyway.