Leopards are easy to take care of quite frankly. So if you arent accostumed to lizards it shouldnt be a problem. For the parrot, it may or may not be. But in any case just feed it, clean out cage. Watch out for its beak. you do not want to get bit by a parrot. It hurts like hell. As for getting rid of one of your tanks, just dont get rid of the gulpers. :P You gotta love those lil guys. Good luck with whatever you end up keeping next. You can also try keeping a small 10g tank or something. That would give you some choices like:
fire bellies
pacmans
dart frogs(1-2)
smaller toads
generally anything small or inactive could prosper in a small 10g. A firebelly toad is active, but its small. So its okay in a 10g. Though its prefered they are in a 20g(length).
In any case just good luck with your animals. :P