that sounds great but am using 18in tubes and holder. Thats four feet it would work if i replace the 20gal to a 40gal. But i dunno there like 90 bucks. I wanted to get the length of your tanks with the repitsun. I use 18inch ones because they hag out in the same place most of the time. I like another idea i got also amd that was mvb that doesnt have to be replaced every 6 months. But my drawback is they have a high uvb output and didn't know if thats good for elderly beardies. Thanks friend