Ok, I will. Thank you for your answer.

I forgot to mark it solved before, sorry for that. I marked it now ;) Anyway, yes. My new username should've been T3STY_1 (since it said T3STY was already taken i had to pick another one). But right after I posted I noticed my username became T3STY (the username I had in my <old> account) and the old account was merged into the new account. That's just great!