You want to keep your heat souce to one side of the tank. This will allow for a heat gradient not only from one side to the other but directly under your basking light will be hotter than half way down and alway the way down. The Tokays will move around to where they feel comfortable. If you use another light for like day/night cycle on a timer just put it high enough over the tank to not effect temp. I use a uv light on a timer that sits 2ft above the top of the tank.
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My posts and replies are my experiences only
1.2.10 Tokays
1.4.10 Leos(13 albino)
1.2.0 AFT's(amel male)
0.2.0 Stenodactylus Petrii(Dune Geckos)

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