Personally , I'd never introduce a cat to a lizard.
They will never be friends and the risk , a very real and very strong risk , is the cat will sooner or later maime or kill the small lizard.
They are perfectly capable of breaking into an enclosure and only need to be able to get an arm (and claw) in to snag the hatchling and drag it out and then torture (play with it) until it stops moving (due to having it's back or neck broken or because it's been impaled by the cat's claws or fangs through internal organs) , even if the hatchling survives the attack , there are very nasty drug resistant bacteria and viruses on a cats teeth and claws which will most likely cause a terrible systemic infection leading to death - these cat induced systemic infections are extremely hard to treat and completely cure and can (I found out the hard way with Lucky) linger in undetectable internal abscesses in a lizard who appears cured and thriving then suddenly the abscess bursts or leaks and it's common for the lizard to be dead within 12hr - 24hrs).
If you have a cat , my advise is never ever let the cat near the hatchling or his tank , never ever introduce the two , it's simply not worth the risk.
This means , in order to keep the hatchling save, you need
>>>to make the tank totally cat proof (cats are sneeky and will wait ages for an opportunity when you at not around to break into a tank and have their evil way with you defenseless little hatchling) , sorry - it's only a matter of time....so puss never gets to meat the hatchling and is banned for life from the room the hatchlings tank is kept in.
>>> never allow puss to loiter where the hatchling can see it or hear it, this will stress the hatchling greatly
>>> if hatchling is out, puss must be locked up, it only takes seconds for a cat to spot a hatchling on the bed , on the desk , on the lounge , on the floor and for the cat to attack the hatchling (guaranteed to result in tears being shed).
I can not state more bluntly, cats are hardwired killers.
They are one of the few animals who will stalk , attack and kill other animals NOT BECAUSE THEY ARE HUNGRY but because they enjoy it. A lot of cat owners think their cat is a wonderful pet who wouldn't harm anything because it is so well fed and lazy.
Another aspect of cat personality is they get insanely jealous of their human giving attention to another animal, and will often attack the new comer out shear vindictiveness.
Cat's are irristably drawn to smaller animals than themselves . A hatchling will be stressed by a large cat loitering near it's enclosure , ontop it's enclosure.
If there was no cat in the house, I'd recommend the dining area, lounge room where the hatchling can watch it's human-zoo and enjoy watching TV .
BUT there is cat in the household, so you are best off keeping his enclosure in your room SO LONG AS PUSS IS BANISHED and never allowed back in there while the hatchling is there, and learn to close the door behind you and ensure puss never slips in.
The boy next door to us found out how bad cats are one day when everyone was out and someone forgot to close his bedroom door, his big sisters very fat , very well fed cat , was left inside the house, (it was usually free roaming 24/7 another issue and a source of conflict with us (was hell bent on exterminating the wild skinks and frogs and birds who had been living and visiting my yard for years) , it broke into the enclosure his breeding colony of jacky dragons was in , and hooked and removed them one at a time and killed 4 of his 5 pet jacky dragons , and maimed the 5th.