Hello

1) they do not need to be separated once they are out of water ( oow)
2) if they still " need " a cup I would not put them together--- but you can put the cups in the same bin
3) I continue to feed ( a little ! ) and do water changes until they are oow

Springs tails are an ABSOLUTE must day one out / regardless of the amount of tail left.

They morph out easily. They will climb out of the water on to the wall of the "tipped" cup... by themselves; at which time you can remove their cup if you want. I remove their cup when they leave it.

I put multiple "tipped cups" in a plastic shoe bin with really wet paper towel on the bottom.
(use distilled water) add a sprig or 2 of some kind of plant from the parental enclosure.
( don't let the paper float--- otherwise they could bet under it !!!

Fold the paper so it's in the middle of the bin....so that only the distilled water is puddled around the edges of the paper towel.... they will be use this water until they are ready to ....well .... hop

A VERY low dish of ABG can be added on which you cold put some springs as well as springs on the paper towel for an easy bite. I offer dusted FF w/ in the 1st few days ( just a couple)

I get them used to soil and plants asap

IMO- paper works better at the froglet stage vs sphagnum--- I don't use sphagnum -at all- for growing out offspring. There is really no 'wrong or right ' way.

Careful not to startle them.... this may make them leave the water too soon

Hope this helps

Abran, PM me your cell # ( if you want) I'll text you some bin/set up photos.
Good Luck !