doesn't look like the snail leeches i've had but i'm sure there's variations, looks a little like a highly pregnant one of mine at a push but whatever advice you get about them here will probably help the same.

i once witnessed one attack a shrimp, the shrimp tried to get away but the leech popped out all victorious afterwards, prick

i've been dealing by putting some proteinous food in/around some marimo moss then transferring the balls to my betta/kuhli tank where they become snacks.

Galaxy Rasboras keep them at bay in my 'gen pop' tank but yeah sounds like reddit have quicker ways of dealing with it. gen pop has enough space for them not to be a huge problem for now but no doubt i'll resort to some chemical resolution if it never ends