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It is too small to be used for much beyond transport, quarantine or temporary housing (i.e. during cleaning of main enclosure). The plastic construction does not allow for light or heat sources which most reptiles or exotic pets require.
Ideally, the UVB light source should run the entire length of the tank. A thermometer/hygrometer should be on each end of the tank to confirm cool and warm sides. Use a digital thermometer to verify temps. Those little ones you have can be inaccurate. Provide a hide on both sides as well. Personally, I would remove the fake grass as it has the potential to cause eye injuries. Your tank looks good otherwise.
Thanks for your question about Smaug, and thanks for the photo as well! I think that you have a good start to your set up, and that we can tweak a few items. First, your lighting situation appears adequate - I see a UVB light (please change this bulb every 4-6 months), a basking light, and a ceramic heat bulb. I would ensure that your temperatures are appropriate for this species, and that you are monitoring them using digital thermometers (I think that you see both a digital and analog thermometers currently) at the level of Smaug. Analog thermometers are inaccurate, so I don't recommend using them (also, they are high up on the sides of the enclosure, so they wouldn't be giving an accurate temperature read for Smaug). For the cage furniture that you have, I like that you have places for Smaug to climb and hide. However, I would recommend having a hide on both the warm side of the enclosure and the cool side so that Smaug has choices. Same for the climbing structures. I may have misse
Thanks for reaching out. Sound like you have a full house. 1. Birds will often bond together but continue to work with them in a quiet environ, offering treats to win and re-enforce trust. Toys, the radio or tv, can all assist with boredom. Setting up foraging toys so birds need to spend time looking for food. 2. There is no such thing as too big a cage. 3. Heating rocks are rarely approved for use, as they will eventually become faulty and get too hot, potentially damaging the animal. A heat lamp is recommended. 4. The bunny's litter box should be spot cleaned daily and full clean weekly. If you can smell it you waited too long. Good luck.
Leopard geckos are great "starter" reptiles. They don't require special lighting (UVB) like other reptiles. A 20 gallon tank is big enough for one. Add a heat source, hides and a water bowl and you are good to go. You can review gecko care at the links below. http://www.reptilesmagazine.com/Care-Sheets/Lizards/Leopard-Gecko/ http://www.anapsid.org/leopardgek.html