One thing I forgot to mention. I was reading that stress could cause a split.. Ive been dealing with a masive flatworm infestation, over the past 2 months ive been manually sucking them out and 2 weeks ago i decided to dip all my live rock with flatworm exit. Then after dipping all the rock i treated the tank. For 3 days all the zoas/palys and mushrooms looked like crap. About a week after, all my perams were back to perfect, every thing opened up was looking better than ever(flat worms were all over every thing) And bam the nem split. So im assuming that it was a stress related split.
BTW I didnt lose anything from the flatworm exit treatment, only problem that showed up was 2 fish had popeye for 3 days or so and every thing is back to normal.