Welcome! Glad you joined. Deferring to others on your urchin
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)
I saw two posts in this thread gave some urchin feedback, but if that wasn't sufficient for you, then perhaps repost in another area of the forum where others would be watching - maybe even 'critter ID' though an urchin isn't what I'd consider a 'critter' (but I could make a 'critter' argument)... LOL
Hello, welcome to R2R! If you're new to reefing(and even if you're not) its a fantastic resource.
As far as the urchin is concerned its definitely not a pencil and more than likely its a Echinometra mathaei or burrowing urchin/ short spine urchin