So I'm happy to say that I've kept at it despite a bunch of setbacks and failures, and currently have 4 growing Gray Tree Frogs which are doing well. This includes the one that I think may have had rub nose, but I'm still unsure (it went away in time, maybe it was just something stuck on his nose afterall), but that's just a quick update for anyone who read that. Anyway, I have the froglets set up 1 in a medium sized pet carrier with a plastic pothos trimming along with a water dish for soaking/humidity. This froglet is the biggest and oldest so far, as I've had him from an original bunch that's about 2 months old and unfortunately, the only survivor. I then have 3 in a large pet carrier which have a similar set up, and they're all doing fairly well (these are separated for quarantine reasons, just as a precaution, and just in case to prevent cannibalism by the older froglet). They are growing with time, but I would say they're still about the size of a finger nail, maybe a little bigger. What I'm wondering, is when is an appropriate time to move them into their big tank? I have a 18x18x24 small-tall which I believe will properly house these 4 little guys, but I'm worried about them getting lost in there, or drying out in the substrate (which is what happened when I first tried my hand at raising a froglet a year ago with zero knowledge of how to raise a froglet).

tl;dr How old should froglets be before they should be moved into a larger enclosure?

And the side question about vitamins and froglets; I have yet to feed my froglets any vitamins because, to be quite honest, I barely know how to properly give them to my adult frog, let alone the little ones. I've heard some people say once a week, others once a month, so I'm confused right off the get go. I also believe in the care sheet it said to dust with a mix of calcium AND vitamins, but other sources have always said not to mix the two or something along those lines. Does anyone have any input on this perhaps? Sorry for the long winded questions, and thanks in advance.