i would go with 2 ocelaris clowns and a watchman goby (they dont get enough credit!)
if your doughter saw a "dotty back" at the store and liked it was a "lavender dottyback" or "orchid dottyback" because thats a fridmani chromis and they need a bigger tank even tho they arnt fast swimmers like say a reef chromis they need space from other fish and can be highly territorial and will claim a nice cave as thier own dont get me wronge i love them they are great fish with a great personality but in a 10 gallon tank they need more roomc ause they like to set up a home and then your clowns have no where to swim
if your doughter saw a "dotty back" at the store and liked it was a "lavender dottyback" or "orchid dottyback" because thats a fridmani chromis and they need a bigger tank even tho they arnt fast swimmers like say a reef chromis they need space from other fish and can be highly territorial and will claim a nice cave as thier own dont get me wronge i love them they are great fish with a great personality but in a 10 gallon tank they need more roomc ause they like to set up a home and then your clowns have no where to swim