a4b972ab_m_and_Freshwater_Fish_Problems__Problem
[Symptoms] loss of color (majority of fish) excessive hiding red streaks darting about fin rot listlessness cloudy eye white film Often several fish die rapidly [Solution] Cause: The most common cause of water quality problems is the buildup of ammonia due to decaying food, overcrowding, or inadequate biological filtration. Ammonia problems also will occur in newly set-up tanks (during the first 3 weeks) if you add to many fish before your biological filter is fully operating. Other causes of water problems include inadequate filtration, improper pH, insufficient aeration, and contamination from paints, sprays, insecticides, or cleansers. Treatment: If you suspect a problem with the water quality first test the pH and ammonia level of your tank. * If ammonia level is high (above 1 ppm.) * If pH is too acid: In all other cases do a partial water change by siphoning 25% of the water from the bottom of the tank. Repeat the partial water change daily until the problem clears. Also check the operation of your filters, and add fresh activated carbon to the filter. Poor water quality can weaken the fish and make them susceptible to bacterial infections. Therefore we often recommend an antibiotic as part of the treatment. Notes: If nearly all of the fish die over a very short period of time it is definitely due to a build-up of a toxin in the water. An infectious disease can be ruled out because they take several days to progress. [Problem] 
Poor Water Quality
Aquarium and Freshwater Fish Problems
Problem