S/he could be stressed. What are your water quality readings? None of those fish (save for the guppy) belong in a 5 gallon tank. A bala shark is a very active and nervous fish, in such a tiny tank, it's possible that it could be stressing it out.
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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