Best Answer: dont do it.. pet stores exploit pets for cash.. they support cruel mass breeding industries.. its horrid.. you will be working with the public trying to get them to buy pets ...
Summary. 1  A mouth ulcer is the loss or erosion of the delicate lining tissue of the mouth (mucus membrane). 2  The most common cause is mechanical injury, such as accidentally biting your cheek. 3  In most cases, mouth ulcers are harmless and resolve by themselves in a few days without the need for medical treatment.
Mouth rot is quite often caused by flukes. If not treated aggressively and quickly the mouth will deteriorate to the point the fish will not be able to eat. Ulcer is deep almost to the bone. Above photo shows fish a couple of days later after only one injection of antibiotics.