That will be a side effect if they visit someplace which have a fancy aquarium lol 
But I am sure that the luxurious casino will have that room, and not all members can use those rooms unless they are a VIP or VVIP member who always spends a lot of money on playing gambling on that casino. Although they have those rooms, they still need to check every VIP or VVIP members and all of the employees who will enter that room, so all of them are clean from the virus.
As always the big wales will be playing seperatelty from the peasants But I am sure that the luxurious casino will have that room, and not all members can use those rooms unless they are a VIP or VVIP member who always spends a lot of money on playing gambling on that casino. Although they have those rooms, they still need to check every VIP or VVIP members and all of the employees who will enter that room, so all of them are clean from the virus.
Own private rooms, private dealers, better food and drinks, etc.But you can't be a 100% that a employee is not carrying the virus. You would have to test that person everyday and still then its not guaranteed. I think the security especially for the high rollers will be very good.
If I were the casino owner, I will test all of my employees, and make sure that they are healthy and clean from the virus, even test it every day. I won't take any risk of the virus, and if one of my employees is a carrier or asymptomatic, I will suggest him to isolated himself, and go to work but I will give something while he is not working.