I have two toads in a 20g tank, black and white pebble under the water which is also spring, cocofiber on land, and they have both real and artificial wood (I had a plant but removed it, but since putting in a UVB light bulb I might put the plant back). I have a 15w bulb in a heat lamp, so it's more intense than just a regular 15w (But it doesn't give off much heat). It also has a 2.0 UVB. They still don't seem to be adjusting very well. Their water is kept at room temperature, which is generally 77 degrees. They have spots of light green, but they are mostly dark. Is there anything else that I may not be taking into consideration?