hello Amit

try here for the volume of your tank

http://www.tropicalfishcentre.co.uk/Calc.htm


sory to hear about the parrots eyes. usualy its the swelling of internal body dluids and the back of the eyes being the softest area they are the ones that swell.
have you tryed any of the medications as there are some on the market for pop eye? im also under the understanding that adding salt with its osmosis ability will help.others may confirm this .

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