I have two 10 gallon axolotl tanks joined by a water bridge. I put a trio of extra mollies in the tank to hopefully "show the way" - the fish have figured out how to go back and forth but the axolotls haven't discovered the bridge yet. Nor have they managed to catch the mollies so for now it is a peaceful existence, even though temporary as the mollies are going back to the live-bearer tank.
My Axolotls - wildtype female, golden albino male
My Axolotls - wildtype female, golden albino male