did some research on common causes of cloudy eye:
stress - unlikely as it is the only fish in the tank
physical damage - as mention above, it is the only fish in tank, unlikely due to fight nor rub against rock
bacterial infection - possible cause, but what could have cause it?
nutritional deficiency - daily feeding, with 1 cube size of EITHER frozen market prawn(50%) OR mysis(20%) OR silverside(20%)
2-3 live mollies OR ghost shrimp occasionally(10%)
% in () shows the estimate frequency
poor water quality - water parameter are as follows
ammonia 0, nitrite 0, nitrate 30-40ppm
pH 8.2, temperature 25-27 degree celsius
what should i do now?
thank in advance for your help