Flying Fox

Can't say much about it's compatibility, but I'm sure it'd be better off in something bigger than a 20g.
 
I'd be wary of setting a fish that size, and that activity level in a small tank. These grow to 150mm/6" and are manically active. They are territorial, and will defend their space quite aggressively if they feel under threat. They generally tolerate other fish as long as they do not look like other FF's in shape or colouration.

As with their near relatives the RTBS and RFS/Rainbow Shark, there is a big difference between the demeanours of individual specimens. Some are totally harmless, other absolute terrors, most lie between generally, but can have peaceful moods or aggressive moods.
 
If they are anything like RTBS or rainbows, if there are plenty if hiding places in the tank, they should be fine and not aggressive. Also, with plenty of hiding places, they will ve able to find a better teritory.
 

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