Is a Hex tank good for any kind of fish? I mean no matter how big they are they always seem to lack length that most fish needs to swim, but can be very tall at times... if a 15G hex has near identical surface area in comparison to a 30G hex, why bother with the 30G hex? aside from bioload purposes... Like I figure the smaller-medium sized ones are okay for guppies and such, but then you see the really really big hex tanks sometimes and you're just like wth why?
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