I have two leucistic Axolotls, they're about 5, perhaps 6 inches long and bought them about two months ago. I really didn't know much about them so found this forum quite helpfull. I also have a hybrid catfish housed with them, and although not recommended have had absolutely no issues between them. They climb ontop of each other, and seem passive, plus the catfish is good at cleaning up. My boyfriend is also raising some egss at the moment, 5 have already hatched, hopefully the other 5 go just as well. I have a 250 litre tank (54 gallons).