Hello FullOfIt, I set bug bombs off in my house twice a year and of course both of my tanks are inside. I turn off ceiling fans, everything to do with the aquarium itself (filters, pumps, air pumps everything). Cover the tank and filter with plastic. It stays this way for almost 2 hours. Then I come in open all the windows, turn on fans and
AC unit fans for 30 minutes. Then I uncover and start my tank and everything is fine. However, there are debates as to how long your cycle will last. I can only tell you what has worked for me. Open your windows (weather permitting) at least cover your tank with towels and turn everything off while they clean. (Make them hurry but do a good job

) I would suggest you tell them no air fresheners/ sprays in your room. They can spray furniture polish on the rag outside of your room
I think your fish will be fine. Leave post it notes if you have to.