I won't comment on water level without observing how big the tank is.
This website will help you out on this.
Sometimes, axolotl owners will check on their pets one day and find hundreds of eggs in their aquarium! In this guide, we will give you advice on safe and ethical options if your axolotls accidentally breed.
axolotlplanet.com
If you can't raise, sell, or the animals came from the same breeder, culling is recommended. And separate the adults.