Overfeeding is the number-one cause of high nitrate levels in aquariums. Overfed fish produce much more waste than normal, and when more food is given than they can take in, the uneaten food rots and produces even more wastes. Keeping too many fish in a tank also leads to problems with accumulated wastes.
Symptoms Caused By Esophageal Ulcer. One classic symptom is a dull or burning pain. It is common with all forms of peptic ulcers. The affected person may feel the pain radiating within the areas starting from the navel up to the breastbone.
Common symptoms of a duodenal ulcer. You may experience duodenal ulcer symptoms daily or just once in a while. At times any of these abdominal symptoms can be severe: 1  Abdominal bloating. 2  Belching. 3  Burning stomach or upper abdominal pain that may be severe. 4  Feeling of fullness. 5  Loss of appetite. 6  Nausea with or without vomiting. 7  Unexplained weight loss.