Welcome and Welcome Back!
I'm a return reefer, too. Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. Like you, I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread and link it to your account, they will give you build badge (look left, under my ID)
[EDIT: going to go check out your build thread! It can take an hour or so after you link that thread to yourself in your account settings, but then voila - your badge appears!]