My tank is also 8 months old and 65 gallons. I was looking for peaceful. The Royal Gramma and the Orchid Dottyback are the 2 most peaceful of their kind (per liveaquaria), but basslets and dottybacks are not known for their peaceful temperaments. I have both, but would suggest adding similar shaped and colored fish together at the same time. I hear fire fish and Assessors are also pretty calm, but need to be added early. I have 2 captive bread clownfish. They are peaceful now, but I don't know if they pair up and lay eggs. Plus you might not want to mix up clownfish species. I have a yellow tang which, along with the Royal Gramma, was a "must have" fish, and while it is peaceful now, it really is too big and skittish for this tank as I think all tangs would be. Plus they seem to want swim mates. I have an excessive amount of rock in my tank, but I did this to provide hiding space as many of the smaller species like hiding places. Plus it helps with filtration and provides places to put soft or LPS corals. You can get more small fish in a tank. For example, my yellow tang eats more than the rest of my tank combined. If he wasn't there, I could probably keep 3 more small fish.
The best advice I can give is research fish first before you get them. Pay attention to final size and recommended tank size. I made a list of the fish I would like to have starting with the must have fish, narrowed it down by aggression, final length, and then reef compatibility. Ideally, this should dictate your minimum tank size.
For personality, my clownfish (ocelaris) are always in the open, even at night, but I don't have an anemone. My yellow wrasse always searches the tank, but at night dives into the sand to sleep. A smaller wrasse would have been a better choice if it wasn't for the tang. The Royal Gramma likes to hover a few inches from its best hiding spot with its body parallel to the rock. At night it curls into openings in the coral rock to sleep. It opens its mouth wide and faces other fish if they swim by too close. They yellow tang wants a swim mate so it follows the yellow wrasse around the tank. The wrasse ignores it. But the tang's sudden movements often scare tank mates. And when they scatter, it hides in the rock as well not realizing it caused the hiding. The orchid dottyback keeps to itself and likes to swim through the rocks. It is the only one that eats from the surface.