Uhh, there are freshwater stingrays. Exactly what kind of rays do you have?
Mudskippers and some gobies are brackish. These guys would probably not make good tankmates for rays though, seeing as they need land to come out onto so that woud be hard to implement in a ray tank. Also, they would become a snack as soon as the ray was big enough.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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