I might be able to give you a little help on this. It took me almost 4 yrs. but have about got a handle on it. First off, do you know what kind of frogs you're working with? Mine have been Cope's Grey Tree Frogs. So if you're dealing with aquatic frogs it's gonna be different. I have hard shelled plastic kiddie pools set up for my 'guys' (and their girlfriends) water plants and a pump. I let everything be from egg up until the tads get pretty good size but no back legs yet. That when the separation process begins...I use plastic dish tubs and combine a 1/2 & 1/2 mix of the pool water (which has some algae, tadpole food, etc. in it) and distilled water. You don't want to completely disrupt the environment they've been in up to this point. Then, into the tubs they go, about 15 to a tub. I'll put in a couple water hyacinth/water lettuce (they like to nibble on the roots) and some tadpole food with about 3 inches of water. Remove some of the water and add a little distilled water every few days. Then I start keeping an eye out for little back legs starting to pop out. When that happens they 'graduate' into another tub. You will start to notice the back legs getting more prominent and 'stronger' and conversely the tad will go from pretty 'chubby' to smaller and thinner. You will then start to notice what looks like little 'bulges' on the sides of their heads. This is the sign that the front legs are getting ready to emerge. That's when they get transferred yet again into another container. This one is clear (so I can see what's going on) it also has higher sides and I cover it with a screen. (I stapled screen material to a picture frame) It needs to fit pretty securely over the top. I lower the water to about 1/2" and place smooth stones and a shallow dish in the container. Tree Frogs are not great swimmers so when the front legs emerge this gives them a solid surface to rest on. It helps if you let the container have a little 'tilt' to it (not much!!) but enough to where there's a little more water at one end and a little less at the other. After they have all their legs they're gonna start climbing up the sides of the container. They will still have a little bit of their tadpole 'tail'. I usually wait about 24-36 hrs. from this point before I take them out. While they are in this container I continue feeding the tadpole food. When I take them out of that container they go to the 'Nursery'. This is more of a small vivarium. I put in small plants (umbrella plant, jade plant, etc) that I like to refer to as 'trainer trees', a small shallow dish with a small amount of water, and stuff like small 'fairy garden' mushrooms for them to sit on as well. I mist the inside a few times a day and once a day feed them flightless fruit flies. I love them, feed them and look after them for about a month or so then let them go in an area next to the house that has a lot of hosta's (where they like to sit, plus they provide some good bugs) and is next to the woods and a creek when they finally decide to venture off. Last year 130 got released. There are 6 so far in the graduating class of 2015 but I've not released them yet and that's just the TIP of the iceberg!! I would separate the tads from the froglets. The flightless fruitflies are best because they can catch them easily and they are SO tiny. The thing here is...mine are Tree Frogs, so they are primarily 'dry land'. But if yours are aquatic they're going to need a good deal more water. And yes, when mine first 'emerge' they are about the size of my pinkie nail. VERY tiny! Last fall I had 5 that were about a month old and ready to be released when the first 'cold' hit. I just couldn't let them go under those conditions so....from the end of October until the day after Mother's Day Bertha, Lulu, Clara, Bert and Earnie had a nice place to live and plenty to eat. Broke my heart to watch them hop off but as my daughter said..."It's the cirrrrcle of liiiffffeeee". I know this is REAL long, but hope it helps.