Welcome melone,
that tank looks cool, but I have not had good experiences with Red sea Skimmers.
Aquapod makes a great nano tank of about the same size.
Also those tangs may be a bit big, but definately the sailfin, aprox 16 inches.
Estemate 1/2 inch of fish per gallon and that is a 29. Then take into effect the ammount of rock that takes up swimming space and you are not left with much.
With that said there are allot of colorfull fish that would fit in well to a tank of that size. Clownfish,
royal gramma, angels (if your not too worried about nipping corals), Gobies, wrasse.
Check those out and see what you like.
Most importantly get the tank fill it with saltwater and get a few pieces of LIVE ROCK in it and just let it sit for a month or so while you do some research on what you want and what works together.
And keep asking questions!!!
