I use the Vision 70 tubs in my RBI racks. I have 5 I think?? LOL
The Vision tubs are WAAAAAAAAAAAAAAAY better than the IRIS ones you get. They are stronger and have flat bottoms so they slide in smooth as a silk... Highly recommend and will be ordering more soon, the only negative part is the shipping is pricey and thus they end up being a little pricey in the end, but well worth it...
I'm FedEx Certified...
Bearded Dragon's and a small collection of snakes are my focus...
"When the ocean dies, surfing dies..."
"Punish the deed, not the breed..."
I used the ARS tubs in the RBI rack with no problem, fit perfect. Both the ARS and Vision tubs are modeled after the Iris tubs so you can swap them out.
There's really no issue with the gap between the top of the tub and the shelf/top of the rack? ARS and Vision have the tubs sized at about 5 1/4" while Iris shows it's CB-70 at 6".