HELP! Clownfish issues

[Chase31]

Okay so i haven't been on the site in a while but this is a little bit of an emergency, my dad works for the school board here and someone broke into a school and smashed a fish tank (guessing 60G or more) there were plenty of fish in it and someone scooped up as many as they could before they died (proboly lying on the floor for a while) and put them in a jar. so my dad phoned and woke me up saying they'll die if i dont try to look after them, so they got home and there was a tang a damsel and something els dead in the jar. only a clown was left in there so i scooped him out and put him straight in my tank as my dad wasn't even sure it was salt or conditioned water, the clown went right to my other clown and is now hiding/sleeping in the bottom, but hes kinda sitting on the bottom and he spins around every once and a while, i have no quarantine tank or anything so this was my only option. so is there anything i can do to help him and see that he doesn't die?