Crystal-like features of the endothelium were noted by Kraupa in 1920, who suggested that the epithelial changes were dependent on the endothelium. Using a slit lamp, Vogt described the excrescences associated with FCD as drop-like in appearance in 1921.uchsâ corneal endothelial dystrophy (FCED) is a degenerative disease of the corneal endothelium with accumulation of focal outgrowths called guttae (drops) and thickening of Descemetâs membrane, leading to corneal edema and loss of vision.
Tropical fish are those that require heated water, generally in the range of 75-80Â°F (24-27Â°C). Because many homes are not kept in that temperature range day and night, these fish require a heated aquarium.old water fish do better in temperatures well below that, some of them enjoy water well below 70Â°F, which is not suitable for any tropical fish. Ultimately the best temperature will depend on the species of fish in the aquarium.
If the water temperature in your house varies considerably from day to day, then you need to install a heater in your tank. Fancy goldfish varieties require a water temperature between 60 o F(15 o C) and 75 o F(24 o C).Water temperature is also very important when breeding goldfish.oldfish are classified as cold water fish and can live in an unheated aquarium at a temperature comfortable to humans. However, rapid changes in temperature can kill them. Maintain a steady temperature. The immune system of fish gets compromised below 50 o F(10 o C).