gurami

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

Hi there I'm originally English but I live in Denmark. I'm fairly new to the hobby - and I've gone ALL in ... within 5 months I've gone from 0 to 7 tanks (360L, 250L, 190L, 150L, 125L, 40L, 20L) and I'm planning on a rack system with 3 x 80L ... I have got the rack system and the aquariums, but...