I don't do plastic. It's not a stable material and some plastics are linked to harmful endocrine disrupting toxins, etc., etc.
I use 16 oz. glass jars, filled with a couple inches of water and recycled from spaghetti sauce or applesauce, for tad rearing. When the tad has popped its legs, I move it to a slanted shotglass of clean water inside a transitional, small viv until it is brave enough to hunt on its own.
At that stage I move it to a regular froglet rearing viv.
I pull tads after a couple weeks of hatching so they get the vital nutrients from the female eggs. Regular clear plastic deli cups with lids. I separate tads no matter what the species... I make tadpole tea, throw in pinches of repashy superpig a couple times a week with tadpole bites. One, maybe two, oak leaves on the bottom. Pinch of duckweed. No water changes. Watch the magic happen