Sharing my experience thus far..
TFC ok to feed..ask
AM ok to feed..ask
LCK 201 ok to feed..ask
Ah Beng u can ask them..depend on when the fish arrived, which tank the fish is put, what fish..
If u r free to feed, note that u try feed a bit (2-5 pellets) n monitor..do not throw too many as u just want to see if the fish feed, not pumping it fat for the LFS..I usually throw 1 pellet try upon given the green light..
Note that a fish feed in LFS doesn't mean it will feed in ur tank..the water & community might cause a stress & it will not feed..but a feeding fish in LFS is better than not feeding at all..if the fish peck at the glass is also a good sign of a feeding fish..after u purchase, the fish's future lie in ur care & luck liao..
cheers