Awesome fish, I have 2 dwarfs and they're amazing. Only reason they would pace the glass is out of boredom. Add lots of plants, mine never pace and are constantly exploring everything. One thing they definitely enjoy are caves and rock work. There are lots of designs you can make with just some slate from PetCo and lava rock that they will love. Your tank looks good, but just a little 2 dimensional make it really captivating for the fish and interesting too.