tell u what m8. i think your getting into what i had yesterday, was he heaps lethargic befor he was like this?. mine was swimmin round runnin into stuff for 2 days then he went head down tail up and upside down. ive had him in a bucket for a day and a half now doing water changes every hour and a half. cant guaruntee as this is just what i did and even though it was just a last thing to try and people said to euphasis, hes now doing well and i also did some epson baths inbetween here and there at the beggining.
if u want to try what i did and u should be right as their 10times more resistant to everything then my large male mature jewel fish. so heres what i did
i started off with 3 epson baths thinkin it might be pop eye then i stopped andf put him in a bucket and i would empty this bucket every 2 or so hours by 90% and refill with anouther bucket which i conditioned water in!
today i am doing the same but as he is now swimming fine and back to normal sort i am treating him internally with aquacycline or whatever it is and im adding half a tablet every water change.
believe me it was touch and go but the feeling at 3am when i took a break from playing spore to make a water change was excstasy to see him back to normal and swimming round the bucket!!! if u got nothing to loose maybe u should give a go what i did! all u need is 2 buckets and some water conditioner and if he corrects his swimming then try treating with something for internal like i did!
this way he is isolated and still getting healthy reoxygenated and chlorinated water!