They can be very timid. Sometimes they don't like light when theyre first introduced to a tank. Mine hid away for around 3 weeks when I first got it. After that it got used to the light being on and started coming out more. leave the light on longer hours and it should start to get better. Make sure you have enough plant and rock cover for it too.
Yes, many fish are quite timid when you first get them. Do you have plenty of hiding places? It's a funny thing, but the more hiding places you have, the more you see of your fish, because they feel more confident!