ANY KIND OF FISH NEEDS TO BE QUARINTENED BEFORE BEING PUT WITH OTHERS!!!
Quarintened means a new fish must be isolated for at least 2 weeks by themselves so that illness won't be transferred to others. Basicly means Keep Dead Sunlight in a seperate containor not shared with other fish. you might want to google quarentining fish or post a thread to learn more about it.
Many new fish fall ill withen 2 weeks, so it is very important to quarintine.