always read up before purchasing anything or doing anything.
that is the number 1 rule when it comes to livestock.
anyway if your tank is not too big they should re-appear and with some luck, pair up together
it's a very timid fish. if your fishes are too fierce, then it will be very shy.
best to obtain stable feeding ones. i bought mine from henry, he has summore left that are stable and feeding already.
if you buy wild caught ones that do not feed and are taking a chance, it's almost 100% failure. super difficult fish.