Back story. I have had 3 rainbow bubble tip nems in my 90g bow front. The biggest one i got about a year ago from a club member.(no i can not remember her name/nick) This nem was about 4-5 inches when wide open. It has done nothing but grow since i got it.It was big, like keep children and small animals away from it big. I have never had a nem split. Well late last week it split into 3 nems. Tonight I was doing some maintenance on my big tanks sump and look up at the 90. One of the small bubble tips had moved a few inches up the rock. I get up and take a look and sure enough one of the little ones split. If this keeps up my zoa dominated tank is going to be a rainbow bubble tip dominated tank.