Hi. I have a Hermann who was given to me with little instructions. He is 2 years old, he seems quite healthy except for a little pyramiding. However, I am trying to replace his UV lamp because the vet told me to change it out every six months. This poor Hermann is housed in a 40 gallon glass aquarium (not for long, I am having a wooden enclosure built for him). The UV light is a T8 24 inch 17 watt bulb. I went to the pet store and could not find a single reptile uv lamp that is this same size. However, I did find an AQUARIUM bulb that fits. But I'm worried this aquarium bulb is not what my Hermann needs. Can I use an aquarium UV bulb for a tortoise enclosure??? Please help. Thank you.