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.
Ulcers do not always cause symptoms. Sometimes, a serious complication such as bleeding is the first sign of an ulcer. The most common symptom of peptic ulcers is abdominal pain. The pain is usually in the upper middle part of the abdomen, above the belly button (navel) and below the breastbone. The ulcer pain can feel like burning, or gnawing, and it may go through to the back.