Bettas being kept as pets will do well on a standard pellet food designed especially for bettas (I recommend HBH Betta Bites or Tetramin granules) with an occasional treat of frozen/live worms or freeze-dried brine shrimp andbloodworms. Pet bettas should not be overfed; a few pellets per feeding is sufficient.
EGD - esophagogastroduodenoscopy. Esophagogastroduodenoscopy (EGD) is a test to examine the lining of the esophagus, stomach, and first part of the small intestine. EGD is done in a hospital or medical center. The procedure uses an endoscope. This is a flexible tube with a light and camera at the end. The procedure is done as follows:
An esophageal stricture is a gradual narrowing of the esophagus, which can lead to swallowing difficulties. The strictures are caused by scar tissue that builds up in the esophagus. When the lining of the esophagus is damaged, scarring develops. When scarring occurs, the lining of the esophagus becomes stiff.