I agree with Cindy, I have two and the one I've had since the tank 4 months ago looked like it was going to split and has not yet. Here's a pic. Also I noticed this one has two holes(mouths)? next to each other, but the blue one I have has them far apart and this green one also has one other hole on the other side. I thought it was trying to split, but it is still one mushroom. Any thought's from Ric experts out there.