Alright, I know that a 5.5 Gallon Tank, is WAY to small normally for two Robos, but I have had them for about two months now, and I am about to move back into a very cramped room. Either way, a 5.5 Gallon tank is about as good as I can do, and they have lived in it before (for about a month), and while they were in there they seemed to be just fine. They are brothers.
Also just to note, they're wheel (Which is big enough for both of them at the same time) is suspended by suction up to the side of the cage so as to not take up floorspace, and there is no food bowl, I scatter it evenly for them to find on they're own, which means I don't have a food bowl either. If I put them in this particular tank I give them at least 3 to 4 inches of bedding for very thorough burrowing. The only thing taking up space is a small dust bath/ pee area (Don't ask me how it works, but they honestly pee and clean themselves in it) that helps them keep clean, as they are in a confined space.
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