I think an Oscar would need a 75 gallon tank, they get longer than the short side of a 55.
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I've had a single female pearl gourami and a koi angel together in my 55g for nearly 2yrs. No issues at all. Pearls are awesome.
Ugh.. more horrible pet store owner recommendations. At a minimum, a single fancy goldfish should have ~20gal, adding 10g for every additional fancy.
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