They're addictive!! My big one split and I tried attaching it to the driftwood. The thread is still there, they grow VERY slow!! :p 2 of my 5 baby ones are in danger of splitting. I gave the 3 strongest ones to Lisa and Chloe but the 2 I kept are half split. Too keep them round just rinse it under water and VERY gently shape it. Hopefuly it seals the split but it could take time. And with a fat-butt froggie sitting on it all day . . .

Wait, is it bad if they split?

Not at all. The only reason they're in a ball shape is due to human shaping and natural water currents. In Japan the natural ones grow HUGE and remain in ball form because the water currents gently push them back and forth. In tanks they remain balls bc of the filters and bc we mold them under water- but you have to be careful! There is no inside to them, so you can un-roll them and that's what I did. Had to tie it to the driftwood so it has something to grow on. If it's just a ball they will VERY slowly grow in that form as long as they're rolled around, otherwise they will attach to something.

They're just aquatic moss, so if I were you, I would leave it alone and try to wait for the split to heal.. Erm, in my experience that took too long and it split all the way. Good luck!