Join Date: May 2009
Location: Port Clinton, OH
Glofish are just zebra danios. Not goldfish.
Since they are produced in mass for the sole purpose of the aquarium hobby, standards arent really a factor for fish like these and the people breeding them probably arent really that concerned about them either. My point is they arent the hardiest of fish and its not unlikely they develope a disease or some kind of intestinal problem.
Egg scatterers like danios also can become engorged with eggs that they never dropped for what ever reason and that can also cause their eventual death. Generally I take fish that look like that out of my tank and out of their misery. Especially if they are cheap, you will spend more trying to treat something than they are worth, with little chance for success.
Whatever you decide, take it out of the main tank to avoid any other fish getting sick.