They don't need complete darkness. Mine aren't bothered if there is dim lighting on in the room. I put the main light on in the room to tong feed them and that doesn't bother them either. Also a simple quarantine setup is a great idea i always do this for new frogs easy to keep clean and check on them and see if they are eating. I would quarantine them all together since they are coming from the same place. Only seperate them if you arent sure if they are eating or not but they are greedy and have a quick feeding response. Dont rush their main tank you should Keep them in quarantine until they are eating and waking up regularly and such.