Can anyone please suggest a way to make the tour stand stop trying to take the guests through the employee only hallways? It was working fine when I went to sleep last night but after loading up today the route has changed and no amount of futzing with the order or position of the tour stand has made it take them through the main museum route.

For the aquariums, the doors are treated as the front of the exhibit, the same as the name plates on normal exhibits. 

Your guides will always take the tours to the “front” of exhibits, so the only way to fix this at the moment is to move the doors to the front of the exhibit in the general public area. 

Hopefully the devs create a fix for this soon.