table salt is fine, its basically the same thing as aquarium salt just cheaper, just make sure to get salt that doesn't have yellow prussiate in it (salts all have to have some kind of anti-caking agent, so just make sure the one yours contains isn't yellow prussiate) i never use aquarium salt, only regular salt. i buy the big blue boxes of Morton's table salt and never had any issues and so do a lot of other knowledgeable members on here. but do water change to take out the meds that are in there, i wouldn't mix the meds with the salt, and yeah i would keep the lights off as well to minimize stress until she starts acting normal again