Hello, I have a difficult time seeing teeny stuff in pics. But if you look up Camallanus pics and see if it is in the anus and reddish. Usually can be treated with Levamisole and Fenbendazole.
You can buy it possibly from a local fish store, or use Liquid Goat dewormer Safe-Guard with Fenbendazole, it is a liquid which mixes with water much more easily than the powder or tablet form for dogs or cats. Or order food from Angels Plus. there are a number of foods which may be better for one external parasite or another.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves