Did you say three siblings? If so, PLEASE PLEASE separate them all immediately!! That enclosure is WAYYYYYYY to small for them to comfortably live- they all need a bigger age of their own. Also, like AHBD said, you need the ReptiSun 10.0 t5 for each of them, no colored bulbs, and just a halogen bulb for heat (during the day only- no lights at night)