We check this website, now onlinetanki.biz is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is onlinetanki Down Right Now? - NO! onlinetanki is up!
If you have problem with access to site onlinetanki, and domain onlinetanki.biz is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).