I think peanuts definitely meant rooms. the more the merrier.
don't forget that it is not good feng shui to have fish tanks in the bedrooms.
just keep it seperate and leave room in the living, dining, kitchen, hallway, basement, garage.
that might just be enough room for the fish... oh as peanuts said 2 dedicated rooms would go well too. make sure u have a drainage hole in the middle of the rooms too... you never know when it can come in handy.. a big basin won't go amiss either.