I am setting up a 25 gallon hex that is a very tall tank but not large diameter, 24 inches high and 18 inches from point to point(15 inches flat to flat.

What would be a good fish for something like this. I was originally thinking great seahorse tank, but have heard they are a little tough to maintain.
Possibly putting in a pair of nemos since this will be in my daughters room with some polyps and shrooms. She's only 2 months old but gave me a good excuse to put up another tank.

Running a 96watt powerquad light, bacpak2R, and possibly add a small canister filter. There's really no way to run a sump on this.