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Money is a singular noun and always takes a singular verb and pronoun.
A collective noun usually takes a singular verb, but when it denotes the individual members of the group and not the group as a whole use a plural verb.
When only one thing is meant we say a clap of thunder and a flash or bolt of lightning.
Fish as food or in bulk (= large numbers) is always singular. We rarely use the plural form (fishes) which denotes fish individually: I caught three small fishes.