Idea
Aquarium out where as you rotate the phone or lay it flat it changes the perspective that you're looking into the aquarium from.
That way if you lay it down flat you can be looking down into the aquarium from the top, and if you have it on the side sending up on a standard holding it up you can look at the aquarium from the side. You can tap into the augmented reality of it by placing the aquarium on the table and you can walk around it and look at all your fish in the aquarium.
Then you can buy different things to add to your aquarium and finish that you can then all that.