I've had this in the tank since it was a quarter inch wide or so and it continues to grow slowly, he hasn't moved or spread anywhere but here. It feels like a trachaphilia(sp?) and it looks like a bunch of orange bubbles interconnected like the top of a cauliflower only less packed together. the right (bottom) side of the picture is the best ID to go off of.. the left (top) is to bright to clearly see anything that resembles what it really looks like.