Lots to say
I wouldn't decorate to much until you get the soil in. Woodchips are almost impossible for a small tortoise to flip back over on if they get on their back. You changed the basking bulb for a UV bulb that won't throw much if any heat, so lowering it won't help and could hurt as the UV would be more intense. You will need either a MVB or incandescent bulb for a basking spot. Which ever bulb you go with you will need a flourscent light for more light. If you go with the MVB, so will need just a regular flourscent bulb. If you go with an incandescent bulb, you will need a UVB bulb (10 would be best). You may also need to use a ceramic heat emitter (in a seperate holder) at night to keep the temperature up as 15C to 18C may be too low to get the little one to want to be active and eat. 18C to 20C would be a better night time temperature.
Danny