what is this fish???
 

Recently, i saw this fish in a pet store( i don't have a pic yet) It was something like a angelfish.the dorsal and ventral fin was yellow with a black stripe.the rest of the body was silver.the water temp was about 24 degrees celcuis. The fish was around 2cm from dorsal fin to ventral fin.Any ideas on what fish it is?

Sounds kind of like it could have been Monodactylus argenteus. This is a brackish water fish that grows fairly large (8" or so) and needs to be kept in schools.