please help just posted on another forum then found this one ,basiclly one of my dwarf gourami died the other day it was not swimming to well and sort of floating round the tank out of control ,i spoke to aquarium guy and he checked my water -fine temperature is normal,tank is clean filters are clean i have 5 zebra danios,5 harlequins ,2 small barbs ,2 little plecos,two koi angels one paradise fish,one dwarf gourami an a bamboo shrimp !! I have been told this is not to amny as my tank is 300 litres.. my problem now is one of my angels is displaying the same sort of behavior ,loss of appetite,not swimming floating around an sometimes gasping please please help me save him thankyou