Hello again everyone

Happy Tuesday!

I just set up my first ever "breeding racks" for feeder mice.
Was wondering if any of you had experience and could give me advice/ constructive criticism based on my current setup.
I read up quite a bit and did what I could with the funds I had. Previously all the girls and their two boys were in a spare 29 gallon aquarium (what a pain in the butt!!)

This is how I have them set up now (btw, this is very thick plastic. Not the clear/flexible stuff the cheaper "storage racks" are made out of. Also, it's too deep for them to climb or jump out)-

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The two bottom racks are occupied each by one male and three females.

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And the top one is full of food and supplies

There's pretty decent airflow b/c of the holes for handles, plus the tops of the bottom two racks are not obstructed or sealed up by anything.

Please let me know what you think, and if anything absolutely NEEDS to be changed either to prevent escape or injury to the mice.