The coils have a bad rap from many years ago but the new ones are supposedly fine. Still, most of us the tubes. If you don't have any issues, then there is no need to change. I always say if you notice your cham having eye irritation then look at your bulbs first as the possible cause. ok, so I like how inventive you are with the IV drip!! lol! i would drip it just a little faster, so it catches his eye more. If you drip on a leaf it will bounce and make motion. He will be more attracted to that I think. Also, what light is that you have hung so high up? What is the reason you do not have it resting on the screen like the other one? oops, I see he is a she you said. Sorry!