[nemo all the way]

i recently bought 3 peppermint shrimp for my new tank to eat the anemonies that are bad...when i was getting ready for bed i noticed about a 1000 little shrimp floting in the tank....i shut off the bubbles and air pumps because it was blowing them around and it looked like snow....i need to know what to do if i should move them into a different tank because the other shrimp will eat them.... i have no fish in the tank yet so i dont have to worry about that...what should i feed them...i heard they are hard to keep alive but ill take my chances...someone please help asap so i know what to do before they start to die