MNFisherman- Fortunately, bacteria known as Nitrosomonas utilize ammonia as a food source breaking it down into nitrites. Nitrites are almost as bad as ammonia as far as fish toxicity is concerned and it's just as well that nitrites form a food source for a second bacterial grouping called Nitrobacter. Nitrobacter break nitrites down into nitrates, which are relatively harmless when compared to ammonia and nitrites. Both of these bacteria use oxygen in their conversion process. This is the reason that ammonia is only a problem in a pond that is overloaded or contains low amounts of DO.

Please no more rain for a month! :|