Figure 8 puffers?

[BullDog]

Hey. I've been on here a couple times a while ago. One time I was trying to get ideas for my empty tank. At that time, I decided not to start up a tank, as nothing interesting was available. So the tank still sits empty. (30gal)

So I was in the pet store the other day, and decided to check out the feeders, and in with the feeders were a few figure 8 puffers! Well, you all know how cute puffers are, and it got me thinking about getting that tank up and running.

Googling 8 puffer care gives you an avalanche of info, no telling what's accurate. I did a forum search but didn't come up with too much.

I was wondering if anyone has experience with these guys? From my google search, some said min 10gal tank and some said min 30gal tank. Would 1 or two be appropriate for a 30gal? (I've read they can be aggressive).
Also, a couple sites said freshwater, and some said brackish, can they do well in both?

Any experience/reliable links would be much appreaciated