Sick loaches

Ok So I have been treating 3 clown loaches with salt heat and parasite guard. Today I did two large water changes and added a filter with just carbon to remove the meds. It looked like 2 of the smaller loaches couldn't handle the meds. None of them are eating and now the little ones are swimming all weird and lopsided even up side down. The tank is also bar and only have two caves for them which the largest loach dont not come out of. I removed everything once when I started treating with the meds.... what is going on now ? The little loaches were great before this happend ate like pigs and swam around with the tiger barbs. I ended up giving the barbs back to lfs because they were picking on the big loach. Plus I only used them for ammonia source while cycling. What the heckler is wrong with them ?

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I know but I was right there nitrites were dropping figured what the hell.everyrjing was alright until I braught one home with ich... all down hill from there....

Is there anything more I could do for them ?

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I did two large ones today. I swore I read somewhere to use salt but I guess live and learn. Also the tanks lost its cycle ... gonna have to figure out how to either cycle again with loaches in there or have a conversation with my little boy and explain what happened to his fish.

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You think it will be possible to recycle this tank with loaches in there ?

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