They don't move much the one she spit up on was a bit loose usually, but I'll keep it out of the tank now that I know that it could be dangerous. The other ones are very sturdy and secure, she was just so heavy that they rubbed together a bit and made some noise. Surprisingly enough when I got home Mama's bulge was 100% gone and she looks like shes hungry... She did have that sort of look in her eyes when I put my hand in the tank to clean their dish I don't really want to feed her again though for a couple days even if she is hungry for the sake of saving enough food to last a while, we only have 5 dollars and its around 4 to ride the bus one way so i cant buy more pinkies till the 4h