How big is this tank?
Honestly, a peppered cory needs a school of at least 5 more tankmates, and a 20 gallon tank. Please take back the cory unless you can provide a suitable environment for it. If you want tankmates for your betta, you generally need a tank bigger than the ones marketed for bettas. At least a 10 gallon, in my opinion.
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current setup:
5.5 gallon low-light planted tank
-1 dwarf puffer named Beep.
for reference: my name is Julie 
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