Does my bolivian ram have a parasite?

I just bought two bolivian rams yesterday, they seem healthy however, one appears thinner and his belly isnt nessisarily concave but completely straight. He also had a small red thing sticking out of his vent but it was incased in a clear tube so im not sure if this is just unhealthy poop. Should I return him? I really dont want to stress my fish out more than nessisaary however i will do what I need to.



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