I have only had this stuff in my tank for a couple of years.It acts like some kind of alien.It will find ways to grow anywhere in my tank.Sometimes the tips will drop off,then get blow around the tank to grow.I recently removed all of it off the glass on one side.Some of the pieces that lost thier slime coat ended up melting away.I think this is a big part of what holds them together.The melted pieces have began to show some new growth after 3 days.And,some of the frags actually attached themselves upside down,and have began to grow new stalks even upside down.If I knew it was going to grow out of ontrol like this I either would have tried to isolate it better or justnot put it in at all.Pretty ironic how I have the problem keeping it from spreading when I can remember when I had problems getting anything to grow!