Join Date: May 2011
Location: Elk Grove, California
Yup, any time you want to introduce any kind of new tankmate, whether it's a fish or a frog, you'll want to quarantine it for at least a week. Most professionals recommend a month but I usually can't wait that long, hehe. After QT, you can put him in the breeder so Aoi can see him, maybe leave the frog in there for an hour, then release him. I have no idea what you'll do about feeding though since I don't have a clue what ADF eat. It's tough with bettas, they are major glut butts. My girls effectively evicted their cory tankmates because they wouldn't stop eating the cories' food; those girls of mine bloated up so big I thought they'd pop!
What are the habits of an ADF? All the ones I've seen are either hanging at the top or sacked out on the bottom, I've never seen them move around too much. To the best of my knowledge, they don't seem to require too much floorspace but you'll know way more than me since you've been doing the research. I would think you can certainly try one in the tank you have, just be sure the frog has a little hiding place in case Aoi gets grumpy with his tankmate. Or vice versa.