It is always a good idea to keep your quarantine or hospital tank running.Actually its great to have both.You should always quar. with new fish.I keep 2 damsels in mine.Also an air stone and 2 pieces of small base rock so they have a place to sleep and/or hide.A hospital tank is a really good thing just incase your fish get sick while theres a new edition in the q tank.Or if you don't want to keep fish,you could keep live rock.The only problem is that you have to make sure if you have damsels,they don't attack your newbies.Also what I did was when I bought my hospital,I exchanged the new cartraige for one out of her lr tank.But she is really cool.HTH