Both actually. Despite the height giving it more water volume that tank has the same footprint as a 29g so that's basically what you're looking at for tank size requirements.
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"The simplest explanation for some phenomenon is more likely to be accurate than more complicated explanations." -Occam's razor
Ok well that stinks it's ok I read ALL over the web and found that one engineer goby will work with other fish so I will do that or a dwarf zebra lionfish
Ok well anything cool seems to not work I'm going into my LFS tomorrow so I will see what they say about my fish selections oh that was the other thing any small fish that look like sharks like a shadow goby
Ya haha you know what would be awesome is a mimic octopus I don't think they would work but they are pretty awesome what is the smallest octopus for an aquarium