There's the restaurant 'Thai-Haus Tuitong' with a very good variety of Thai food, located in Ulm, Baden-Württemberg, Germany.
They have glutamate free food on their card and while the food is prepared, you can watch the aquarium and stay for a moment in a colorful underwater world. The rooms are air-conditioned, the decor is unique and the food is delicious. However, you should always book in advance because the restaurant is busy. But even if a lot is going on, the service remains friendly.