于 2002-04-09 11:54 My tank is just 3 months old and a number of "open-tank" fish died already. Now, only 2 blue deaman and 2 doctor shrimp + 1 blue circle left. The blue deaman and doctor shrimp has been in tank since open and they are in perfect health. I keep on change water 20% on every 2 days. The white layer spread to 1/3 of skin already. Besides that, the fish seems very ok and eating fast. Anyone has similar situation before????