Hey! It looks like I'll be the new Wiki Manager for Diep.io, as Psi seems to have moved on to other things. I'm here for community/technical support and as a liaison for staff etc. etc., I'm sure you know the drill. I'm very excited to work with you and the community here! Please let me know if there's anything you need, and I'll do my best to address it. :)
Don't use a tabber, they are highly discouraged on articles as they make content less accessible & render poorly on mobile without extra coding. Most of the time, they hinder readers rather than improving layout.
The standard that I would recommend continuing to use, at least for now, is one History section for all changes. Separating each tank's couple of changes throughout Arras's year or so of existence isn't all that necessary or clearer, to be honest.