I too have a number of these racks,from the hatcho rack,v35,and v70 the gap in the v35,and v70 is less then what you would get in the a normal glass sliding enclosure,so you wouldn't keep hatcho's in the v35 or v70 anyway.
As for the level 15 hatchling rack it's the best money I have ever spent, I got my money back on my first clutch.
