Summary. Ammonia is a major waste product of fish and is also produced as a breakdown of feed and other organics. It can accumulate in aquaculture or aquarium systems, where it will, at the very least, decrease production. It is frequently a stressor that leads to disease, and in other cases it kills fish directly. The un-ionized ammonia is in the form of dissolved gas. Increasing pond aeration or the process of removing dissolved gases is another way of decreasing ammonia concentration in a fish pond. In a small scale pond, aerating will remove the dissolved toxic ammonia through diffusion from water into the air. Chlorine can be removed from tap water by either leaving the water open to the air for a period of time or by introducing air bubbles (via an air pump and air stone) which will accelerate the dechlorinating process. Chloramine, on the other hand, will remain in tap water for an extended period of time and requires a chemical or carbon treatment The concentration of ammonia in water is important in determining its toxicity to fish. A concentration of 0.05 mg/L (0.05 ppm) of ammonia can stress and damage fish gills, and eventually, 2.0 mg/L (2.0 ppm) leads them to die. Ammonia levels should be kept at 0 ppm, which is neither harmful nor stressful to the fish. Most will neutralize the chlorine in a bucket of source water in a minute or two, and will neutralize chloramine in as little as five minutes. Remember to check the directions on the chlorine remover you choose to use and make sure you follow those instructions. These will tell you both how to dose the dechlorinator and how long it should take The way to solve the problem depends on its cause. It may take a little investigation to determine why the ammonia appeared. There are several ways to reduce the level of ammonia in in saltwater tank: 1. Change Water. This is the easiest and fastest way is to partially replace a large amount of the aquarium’s water. Nitrate Solutions. There are various devices and procedures that can lower nitrates in an aquarium. Nitrate-adsorbing filter media and anaerobic denitrifying biofilters will remove dissolved nitrate, but they will do nothing to eliminate the cause of the problem. The simplest solution is a water change. When you remove a volume of water from 0.25 ppm. 0.25 ppm is a safe level for a cycling tank that has fish. Fish are better off with 0.0 ppm. But if you have to expose them to ammonia, 0.25 ppm is somewhat acceptable. But that is only true in the short term. Long-term exposure to this level of ammonia can compromise the creature’s health. 8IgSuRL.