Pls help, My 4" oscar is breathing heavy and not eating

I just noticed yesterday my oscar acting very strange...

He is breathing pretty heavy, not interested in the food and looks to be zoned out at the bottom of the tank.. or swims to the middle..

he was normally the 1st one to notice me when i get home and always at the top of the tank ready to eat!

but since yesterday he is having those problems stated above..

I do weekly water changes (180g tank and do roughly 30G water change) - the Conditions are and have always been

PH 8.0
Nitrite - 0
Amm - 0
Nitrate - 10ppm


i havent added new fish or anything..

what could this be? he was perfectly fine a day and a half ago!

pls help.. thank you!

the temp is 80... i just finished a 50% WC as i posted the opening thread... He doesnt have any new wounds ... the decor hasnt been moved.. and he is the most aggressive (and biggest) in the tank lol.. i also have an air wand running 24/7.. (should i add more?!)

i got a GT, Severum - Uaru - baby Jag 2" and him... (180g tank)

i hope the water change does the trick!

the GT is the same size... they go at it often... but its a few seconds and then its over... if he did get bullied , how long is normal till he gets over it.. cause since ive been home i havent seen any bullying ...

this morning he is still not eating and breathing very heavy and not really swimming around much.. i have no idea what happened but it seems like it happened out of no where..i also noticed a solid white stool coming from him... not stringy , just white... not sure what to do

he is also swimming funny now , ... a little wobbly at a slow pace

i might have to use a parasite guard.. i just noticed him flash.. 2xs.. so im guessing he has some kind of parasite... whats the best method and treatment..


good idea.. thanks jaws