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I just added this fish to aquarium 2 day ago and now noticed that it has a reddish line behind the fin. Is this normal or is it a parasite?

It look like a white spot near the dorsal fin on its back with 4 lines that look like an X. At first I thought it was some kind of parasite attached to the back because when I first acclimate the fish and introduced to quarantine tank, I noticed something that look like a shrimp the size of a...

I bought 4 gold laser cory online and noticed this on one of my corydoras. I am new to aquarium hobby and have no idea what this is. It looks like cracks under the skin. After 2 weeks, I also noticed it on my other corydoras too but not as severe as this one on the same exact location. I...