They naturally extend further at night because it is safer for them, meaning there is nothing that will nip at them. You will always have larger extension at night than during the day.
I do not. Pictures will come when they are of age.
That is not a very safe enviornment for the Seahorses. Flame angels and damsels are especially nasty.
A lot of it really is mental. I'll ask my coach to "spot" me while I do something that I know I can already do without help, just so I have the comfort of knowing he's there to help just in case. When really, he just stands there.
It's common when starting a new tank. It will disappear over time. You can cut back on your light time. Maybe 7-8 hours or less a day. Also cut back on feeding.