Welcome! Glad you joined. You must be excited about your upgrade!
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). You might even do a thread for each tank, assuming you are keeping your current 30g tank up once the 90g is going.