Just be sure to make it really pretty. And if she wants let her add a couple of fish she likes. Also a trick I learned is to keep it in your room. Then after a while when they get used to your tank and like it just move it where you want. My mom said she didnt want anything bigger then a 29 gal. Last year for x-mas I got a 55 and this year I'm looking into a 125. HEHE