There are a lot of ways you can do it. Why do perceive the tank's size as an issue? This doesn't matter, really.



We've done it many ways. Usually, we cut a circular hole in the top- at the far side of the designated basking area. The fixture sits tight in the hole- and the light consequently, goes into the fixture, but inside the cage. We typically caulk around the fixture so it is tighter and more secure. This is just one way.



Best thing for you is to choose one solid top and fit it (wood, for example) and use this. This won't cost you that much.



You should try to limit the amount of captures you do- unless they are necessary. And also, the enclosure changes. Find something that works and is useful and stick with it and in your case- until the growth deems a larger cage. The moving around, capturing and all that sort will cause the animal to retreat away from you.



Hope it helps.

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