This is how I separate mine:
A large plastic tub from Walmart, 32oz Deli Containers( got them fairly cheap on Ebay,tub can hold 22 containers, you need 44 for each tub.
Put holes in half the containers,slide them in containers with out holes.
When you change their water, pull out the container with holes in it and put in a new container with out holes and treated water( I have 5-5gal buckets with heated water to put clean water in the new Deli container),total Deli containers needed=66 per tub.
The dividers are silicone cutting boards, cut to fit(also from Walmart).
Keep an eye on the water in the tub, so it does not expose the heater.
You can use jars or whatever in place of the Deli containers, I just use them because they make changing their water easy.