Ditto Dat^^^Guessing and giving medicine is not good animal husbandry.
If it's that hot there, I would first suspect dehydration in a bird that was lethargic and inactive.
A dose of Sav-A-Chick electrolytes/vitamins would be the only 'treatment' I'd give.
You can mix a small amount(1/8 tsp SAC to 1 Cup water)and give in a chick waterer or dish. Provide fresh plain water at the same time.
Don't separate the 2 SLW, if they do have some disease, they are both already exposed.
A large chunk of ice in a shallow pan can do much relieve heat stress.