Last year my axolottles laid plenty of eggs that all developed well. However they failed to break free from their eggs and after finally trying to release them opening them up with a scalpel they span round in circles for a few days before dying. I suspect that this may have been caused by a lack of minerals on the water as I had moved six months previously into a soft water area. I am currently experimenting with adding minerals and salts to the water. Has anyone come across this before?