First of all (im sure you did this), separate the two.
Add aquarium salt at 1tblspoon/5 gallon. Temperature up to 86-88F to help kill off parasites. Dose with Mela/Pimafix and add some Prime or stress coat to help replenish the slime coating.
Change water every other day at 40% and repeat with salt, Mela/Pimafix and Prime/Stress Coat. Depending on the size of your jardini, he should be as good as new in a couple weeks.