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 . . .