Yeah, definately NOT a good idea. All amphibians, and especially toads produce some degree of toxic defense. There are a few animals that can eat them because they have developed minor immunity, such as Hognose snakes, but leopards don't have this. Feeding toads to your gecko will kill it. Not to mention wild caught food items are almost garunteed to have some sort of parasitical infestation. Stick to captive raised feeders.
Additionally, I'm not sure a 75wtt on a ten gallon wouldn't produce too much heat, make sure you monitor temperature or else your lizard could end up cooked. Remember you need to provide options in temp so the animal can thermoregulate, as in a 83-90F basking area and a cooler, 74-80F area so he can escape the heat. If temp is correct, then using a red lamp for 24/7 heat is fine, the lizard can't see the light, so it won't disturb him at night.
