They are perfectly happy living alone, but I would advise getting at least two - it's funny watching them interact. :)
I have, right now, four frogs in a five 1/2 gallon. This isn't my ideal setup, before they had babies I had two frogs in the same five 1/2 tank - that's what I'd recommend. 2 gallons per frog, mostly because I hate seeing the little guys stuffed in tiny containers. You never get to see their antics like that. Anyway, you have to get to know your frog. My four each have different personalities, some of them hunker down for the day in one spot, others are always zooming around. If you have a zoomy frog, it would need more space, if you have a frog that's retarded and can't find its own food (I do :/) you'll need long tweezers to feed it with.
They're not really bright, so they won't go insane in a small tank, however these frogs are tropical and like their water temps to be middle-high 70's, so they do need a heater. Smaller than 2 gallons = hard to heat. That's why I've got my guys in the 5.5, same as my betta gets. I don't have a light for my tank since they're nocturnal, and they seem to like it like that. However, I gave six of my babies to a guy with a lighted planted tank (huge), and in the photos he sent me, they look great. So it's up to you.
Um, food. I feed my group HBH frog and tadpole bites and frozen bloodworms. Two years of owning them, no problems. I think this diet is great although many advise more variety (I'm not really in a position to provide). The HBH pellets are soft so they won't cause impaction, and the bloodworms... well, those are the favorite. I get them frozen, again, to avoid impaction. You just can't let them thaw or spoil.
Um, wall of text. Sorry. Hope this helps.
Just to add, I see my frogs all the time. I'm not sure when they sleep, despite their nocturnal habits, but there's always at least one smashed against the glass waiting for food, or one poking around in the gravel for scraps or zipping about aimlessly.
Also, some people seem to have trouble, but I have found caring for ADFs easy and rewarding. They get about the same care level as my betta (other than feeding by hand, but I think that's really fun).
Robert Falcon Scott - Red salamander HM plakat
Passed on- Friedrich "Freedy"
Four African Dwarf Frogs - Dorkus, Sporkus, Baron(ess), and Bubbles!
Last edited by FuulieQ; 12-09-2010 at 01:31 PM.