I dunno. He was like almost 2 inches across in diameter when we first got him. Was doin awesome, always totally layed out and real big.
Then one day he lo0ked kinda like a clover .. and I was like oh great, he's dieing on me. I dont think this was because of him tearing. There is no totalyl direct water flow hitting him (would take a lot to rip him in half I would imagine) and nothing in my tank that would/could do that.
Then he started spreading out again and it became apparent that he split exactly in half.
The flat part started curling around to start forming a disc again and the stems are healing up. The back one (Daryl) is moving back I think, or maybe the front one (his other brother Daryl) is moving forward. Either way, their moving apart and are now becoming 2 seperate mushrooms.

And yes, this hobby is simply amazing!!