My friend recently got a 45g aquarium and is having me build it. Years ago she had a 10g with: 1 betta 2 black skirt tetra 3 neon tetra 2 guppies She was exceptionally lucky that this group tolerated each other but she tried to add another guppy a few times and always ended badly for the new comers. SO, she started off wanting this same group and I explained about schooling and aggression and, after a trip to check out an awesome huge LFS the other day, she changed her list a bit. She really liked a lot of the cichlids but I don't think this size tank is enough and she would also want other community fish which wouldn't work. She is still adamant on having a betta. I know the last four wouldn't fit in a community or this size tank but would like some suggestions overall. This is her list of fish she likes(* next to ones she really likes): *Betta (I convinced her to go with a female) Sparkling gourami *Serpae tetra *Cardinal tetra Rummynose tetra(maybe) Platy(1) *Guppies(2) Endlers *Panda Cory Hillstream loach GBRs *Cherry shrimp Flower shrimp Neolamprologus caudopuntatus *Gold Dojo loach(1) Dino birchur Speckled tulip eel This is the current setup. She originally wanted black sand but I think decided to go with white.