| I agree completely with rob.
If you want 2 clowns get a small Maroon. If your current clown is a gold strip get a gold strip. If its a plain maroon get a plain maroon. Make sure its smaller. They will bite and flip thier fins at each other, this is normal. Give it a few days and they will calm down.
If you are getting another clown just for the anemones it dosn't need one. I havn't had 2 single clowns of a differnt type in the same tank.
I have tried to house differnt clowns in the same tank a few time. Heres what happened to me.
2 Orange skunks in a 55 reef (alone for 2 months) Beat the cra* out of 2 gold strip maroons
Same 2 Skunks got along with a single True Percula in the 55( after the maroons killed his partner in the 240)
Moved the 2 Gold Stripes to a 240 with 2 other Gold Stripes (They had been the only clowns in the tank for months). They didn't get along at all.
Final arrangments
2 Orange skunks in a 39
2 Gold Strips maroons in a 240
2 Gold Strips maroons in a 55
My 240 cracked and I put all my fish in a 150 gallon rubbermaid tub and lost all my fish but the female Gold strip. When the new 300 was up and running I put all the live stock from my 39 into the 300 at the same time as the female gold strip. To my surprise they left each other alone. About a week later I had the chance to get a smaller gold maroon and put him in with the other 3. Its been a month and they totally leave each other alone. Maroons stay to the left and Skunks to the right. The skunks are hosting in a huge toadstool and don't stray to far away from it.
This may be caused by a few factors:
Large tank (But I've had problem in a large tank before dosn't alway work)
All fish added to a new enviroment at the same time
Female maroon was very stressed and hide for a few days
Just be careful that you watch them very close if you mix clowns. Make sure you can remove one clown and have a place to keep it. | 
