While there are many different methods for keeping chameleons these general guidelines can be applied successfully to most species.
Waterfall - Reptile (or any small) waterfalls do not have filters so they grow mold and bacteria very quickly and are not safe for drinking. Drippers and misting only should be used for chameleon drinking.
Water bowl - Chameleons do not and should not drink from standing water sources. Bacterial growth is fast and they could potentially drown. In the wild they drink the dew and rain drops on the leaves of trees. You need to simulate this with a dripper or heavy misting so that water droplets accumulate on the leaves of the plants in their cage.
Heat rocks or pads - Unlike ground dwelling lizards, chameleons do not seek a warm rock to bask on. They are strictly arboreal (tree-dwelling) reptiles and seek out sun from above to bask in. Ground heat sources can burn their feet and belly easily and should not be used at all.
Fish tank aquarium - Horizontal cages are not appropriate for chameleons as they are arboreal (tree dwelling) animals and need vertical space to move throughout the temperature gradient. Fish tanks do not provide the vertical space or ventilation needed.
Lightbulbs inside cage - Chameleons are very good climbers and always find a way to crawl onto the light bulb or light fixture, even when you think it’s safe. Severe, life-threatening burns occur this way.