I am not 100% certain, but I believe that roaches are not usually killed by sealing the home and then fogging the home with chemicals. I believe the killing agents are actually applied to surfaces usings sparys and dusts and using poison in traps. Only when the infestation is really bad will they spray and, in the worst cases, seal and fumigate.
So, before you go nuts on taking protective measures you should ask what they plan to do. If they are going to fumigate the entire hose I am not sure how well you can protect tanks. If you seal them and have no air exchange the oxygnen in the water can be used up and the fish will suffocate. If that is the case you would have to get the fish and their tank(s) out of the home before they fumigate.
From the Google AI:
To treat homes with roaches, pest control professionals and homeowners alike often use a combination of methods, including cleaning, removing clutter, applying insecticides like boric acid or diatomaceous earth, and using bait stations, with the goal of eliminating roaches and preventing future infestations.
3. Professional Pest Control:
Exterminators:
For severe infestations, consider contacting a professional pest control company.
Treatment methods:
Exterminators may use a range of methods, including insecticide sprays, baits, and dusts, to target roaches and their hiding places.
Fumigation:
In severe cases, fumigation, which involves sealing off a facility and introducing a fumigant gas, may be necessary.