It looks good to me. I like to drop some slightly larger than pea gravel size rocks in the water to give them some landing areas and to give them a choice as to how deep in the water they want to be. I have three boreal chorus froglets in a similar setup.

As for when to swap them over, I decreased the water level in the tad tank so there was no risk of drowning but didn't swap anyone over until they started losing their tails (and climbing the walls).