Question about hatchling racks...

I am planning on buying a vision hatchling rack next month, but I am a little concerned about the tub size. The tubs are 18" long x 7.5" wide
x 3.5" tall. I know this will be fine for when they first hatch out, but how long do you guys think I will have before having to upgrade the babies tub size? Do any of you know of a rack with slightly wider tubs? 7.5" wide seems a little small to me. I would like a rack that could hold hatchlings until they are around 600g. Thanks for any help.

I would say with the length of that tub, you could probably easily house a 800-900 gram snake in there. Also, I think a 1000 gramer could probably be housed in there too, if you had intentions of getting it out soon. Just my opinion, others may feel that that is pushing it. If they are eating fine and thermoregulating on their own in the tub, I think they are happy. Let them dictate when they are ready to be moved.