fish/inverts for a fluval edge? (6g) (heater suggestion also)

love this tank, i have one set up with a little trimma goby (i could prolly add another fish but for now thats it) some hermits, snails, polyps, gsp.
 
i'd go with a small goby, some like to be kept in groups.. and with no other fish intank they won't hide much.

I had a pair of blackfins with a pistol cool little group.

trio.jpg
 
They were in a 30g with a few other fish, but they stay small, those guys were under 2" long. With a decent sand layer and some rock and no other fish you'd prob be ok.
 
i think i'll go with them. what are they called?


also a pistol shrimp is probaly to large for my 6 gallon? they size tank does a pistol shrimp need?
 
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