Eventually found everything - we think.

It seemed expensive at 25 euros each, and was quite chaotic in the entrance lobby with no instructions as to where to queue. We were let in after some time, and to begin with were disappointed, as we looked into small display cases, it is a pity that there seems to be no directions as which way to find your way around, but eventually we did find the bigger tanks which did have some wonderful fishes within. I didn't find the notices near the tanks to be very clear, and it would have been good to have some translation of the information. We spent about two hours finding our way around, and on the whole enjoyed our visit, but maybe it is not quite as exciting as the London Aquarium.