I think your planning a great tank all of you will enjoy especially Freddy. I think the Angel should be fine a 4”. My majestic is about that with all the other big guys and it is very bashful. If the lemon peel is fast I think it will be ok and you can keep your drag tank. We have frags in our sump and they love it. Have a good night and let us know what you decide to get. Sometimes I just get what my LFS owner has when I go in, for example he had this beautiful annularis angel and I just decided on a whim to bring it home. Was already I. Quarantine and eating and health so I put him in my reef. Gorgeous fish! Sometimes I’m surprised when I pick things I did t know I wanted!