Lip locked true percs?? With pics.

[spleify]

I recently purchased a new true percula, I already had one in the tank. The new one is very healthy and is eating, but the old one just will not leave the new one alone. They fight like crazy. They fight, bite, and get head to head like in a face off, and then they lock lips for like 20-25 seconds. I'm pretty sure this isn't normal. Are they hurting each other? Are they just not compatible? I have two false percs in there also and they could care less about the new addition. Thanks in advance for any help.
http://reefcentral.com/gallery/data/500/117519LL_Perc_2__Medium_.JPG
http://reefcentral.com/gallery/data/500/117519LL_Perc_1__Medium_.JPG

[GSMguy]

first off there are 4 clowns in there take one out one pair those True percs look like they both want to be dominant.

[DiViNeLeFT]

i would read over some of the FAQ...

http://www.reefcentral.com/forums/showthread.php?s=&threadid=282136

especially the ones on pairing, sexing, and keeping multiple species. there is some good info there on keeping clowns with long term success.