Yes, of course you can add it. Hell you could put an arapima in there if you want, or a great white shark. Will it work? Who knows, its a different question, if thats what you were trying to ask then you should have provided us with the answers to these;
How big is the black?
How big is the lei?
How big is your tank?
Is your black aggressive?
What are the tankmates?
What do you feed?
Any other facts or info that we should know about?
How the hell are we supposed to answer that question with out any information?