no freshwater ray will be able to able to live in a 55 gallon tank long term. do you know what kind of freshwater stingray it is anyway?
and yes, plecos are known to suck the mucus coating off stingrays and kill them. some do, some dont. depends on the pleco.
the stingray will also eat anything that will fit in it's mouth. if you look in the fish profiles section, i made a profile on P. Reticulata, a species of freshwater ray. it has a lot of general information on keeping rays that you should take a look at, because even the smallest available freshwater stingray will need AT LEAST a 125 gallon tank, more preferably a 180 gallon.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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