I have been really happy so far with the V-70 tubs from Vision. They fit the CB70 rack perfectly to where I don't need to drill added ventilation, they are smooth and flat bottomed so they have great proximity to the tape but don't ever touch it, it's clear enough to see inside but still give your snakes a sheltered feeling and snake mess is really easy to remove. One downside was the first time they shipped rough, with 6/10 badly broken, but they were good about speedy free replacement shipment. I currently have run the CB70/V-70 combo on a herpstat for almost a year now and LOVE everything about it.