I'm sure you've heard this before, but plecos and goldfish ought not be mixed due to their different needs in temperature. Sinking shrimp pellets aren't really adequate nutrition for a pleco, at least one that isn't mostly carnivorous (clown plecos are) You should supplement his diet with cucumbers, algae wafers, etc.
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current setup:
5.5 gallon low-light planted tank
-1 dwarf puffer named Siddartha.
for reference: my name is Julie 
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