scar

Yesterday I got a gurami for my tank. I didn't notice this when I got him. What Can I do? What is this scar? Please help, Thanks

Hello, I have a 29g tank with cardinal tetras, two honey gourami (one red), 5 pygmy corys, a clown pleco, shrimp and assassin snails. I have a gravel bottom, driftwood, and a mix of live & fake plants and two fake logs, one floating. Something happened to one of my gourami within the last 20...