Aquarium shooting!

The visiting place for the next shooting was determined as Aquarium Osaka at Dojima River Forum on 24th coming Tuesday. Consequently, I tried shooting a small fish in my aquarium finding out the greatest difficulty. Moving target with manual focusing condition in macro 100mm lens is above difficulty. In addition, the requirement is focusing eyes the first. Several training to get accustomed to the difficult location is necessary in new world. But I could obtain the information from the Website about the actually exhibited aquarium, huge and big ones! It's far from my imagination! Consulting about the shooting to a professional photographer who is doing that in the sea by actual diving photo, the conclusion was very simple at all. Smartphone would be the best shooting equipment that is far superior to another big and noble shooting device. Judging from the size of the target and pan-focusing is required, the conclusion he proposed is to the point at all?