Welcome to RF!! :welcome:. Tell us a bit more about your plans. It's hard to recommend something going on your first post. Do you plan to run a fish only system? Reef? Closed loop? Single over flow? Dual? Etc.
Looking forward to the build. Also, in the meantime, if you want a few ideas, check out our large tank section dedicated to those with tanks over 300 gals. May give you some ideas.
I think you have a minimum post requirement to meet first which was put in place to protect us from spammers. It's not a whole lot though. I think it's less than 10 posts. I will send you a link you can try to see if it allows you to post pics. Give me a sec.