Is not very advisable to starve the fish in the beginning and force them to take pellets or mysis in the beginning. First of all.. You might not known when is their last meal, some fishes once been starved, they will starve themself all the way till death even if we give in in the end and feed them live food etc, which Is alrdy too late..
More advisable is to set up a QT and seperately beef them up before starving them and change their diet.. U may wana start introducing garlic guard in their meals including mysis/mp.. So when u add pellets into their food, they might not be able to smell it.. And through time, they will learn to accept pellets. Goid luck and happy fish keeping.