I love this lily. There are smaller ones though.
It has around a 30 inch spread so anything bigger than that should do.
My friend has one above her goldfish tank. Its a very profuse bloomer so you do get a few more blooms than normal when in a tank.
If you have too high a light before it reaches the surface it just stays down low for some reason.
The leaf size varies from location to location but in general its around 3" - 5". And the flowers around the size of a quarter to 50 cent piece. They range from a light creamy white - a soft daisy yellow.
Thats about everything I can think of.
There are lots of other lilies with different size and colour leaves and flowers that have the same spread.