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The Tough Fish appear in multiple episodes, some being "No Weenies Allowed," "Plankton's Army," "Krusty Krushers," and "The Cent of Money."
The Green Fish was seen entering The Salty Spitoon. He had multiple tattoos, and SpongeBob pretended to be one of the tattoos.
The Orange Fish got into a fight with the Purple Fish and was allowed to go in.
The Purple Fish got into a fight with the Orange Fish. He then entered The Salty Spitoon.
Reg asked if the Scaly Fish was bothering SpongeBob, just before the fake fight with Patrick.