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Libby, your fish "pocumuss",
is a Plecostomus, or more commonly, just Pleco.
I hope youre aware that these fish can reach 24-28 inches if
its a common pleco.
Youd be best to return them both to the pet store.
There are no Plecos small enough for tanks less than 20g,
and even then, there are a very limited number of plecos that small,
all of which usually run 40.00 and up.
Bettas can be kept in community tanks, depending on what
fish you have, and what the temperment of the betta is.
The Betta we have been discussing is a female, and females are
much much much less aggressive than males, and dont have the
long flowing fins.
None of the fish you have mentioned are incompatible with male or
female bettas, except the male guppies. Betta males will kill Male Guppies
due to the long colorful finnage.
I have kept several male bettas over the years in my community tanks
with no issues between the Bettas and the other fish.
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