@Boap: I think you should add a minimum belt requirement. You wouldn't want low belts, maybe noobs and inactive players in your clan, would you ?
Black Belt sounds reasonable.
Applications can be very decieving, the low belt or noob might say he loves ABD and always active, but then does the complete opposite. You wouldn't want that, since you're always urging for activities and hopefully recruit some players that are at least 12 hours active in-game or forum active. Oh, and plus you wouldn't stupid, arrogants alts joining your clan. If you can, try to ask them how they were banned and give them an in-game test, or accept them if they have evidence that they are a legit, good ALT. I'm not forcing you to do this, but I'm doing whats best for the clan.