Safe or too crowded for axolotl?

My Axolotl is about 8 months old, I'm not sure if the tank I made is safe for her or not. The bottom of the tank will be vacuumed of debris before she goes in. The tank is 29 gallons.

My Axolotl is about 8 months old, I'm not sure if the tank I made is safe for her or not. The bottom of the tank will be vacuumed of debris before she goes in. The tank is 29 gallons.