Do NOT get a sixline wrasse. Will torment and pick on other fish. Mine basically destroyed the fins of a yellow tang and killed it in one of my previous tanks
If you have a deep sand bed, also do NOT get a sand sifting fish or invert of any kind including the diamond goby. They will eat all of the beneficial organisms in your sandbed. If you don't have a sandbed and don't mind sand on your corals and rock, a sand sifting goby is right for you! They are great little fish but they jump and get sand everywhere from my experience. I found mine behind the tank dead and looking straight at me but still looking like it was in the position it would be in underwater.
Here are some fish I'd reccomend
•Chaetodon Miliaris - Millet/Milletseed/Lemon Butterflyfish
A smaller butterfly (~4-5in) that is typically reef safe, hardy and usually accepts food readily. Most likely will not eat mobile inverts unless they are tiny (<1in)
•Forcepiger Flavissimus - Yellow Longnose Butterflyfish
One of the most reef safe butterflies in my experience, as long as you aren't concerned about worms (tube worms, feather worms, etc worms). Hardy and usually accepts food readily.
•Centropyge Eibli - Redstripe/Blacktail/Orangelined/Ebil's/Eibli Angelfish
Depending on the individual, may occasionally nip at sessile inverts. Generally shy at first but becomes more assertive once established. Not fragile but not hardy.
•Nemateleotris Magnifica - Firefish/Fire Goby/ Firefish Goby/ Fire Dartfish
Hardy and easy to care for. Great personality and color but a jumper. Have a cover. One of my favorite smaller fish.
•Meiacanthus Oualanensis - Canary Blenny/Yellow Fang Blenny/Oualan Forktail Blenny
Generally peaceful and easy to care for. Amazing yellow coloration. Have a cover because this fish jumps. *venomous bite for defense
•Felis Catus - Domestic Aquatic House Cat
Extremely aggressive and will eat all fish and inverts and spread hair all over the tank. Makes a meowing sound when you walk by the tank. Not reef safe as it will destroy all corals with its feet and claws. Very needy and needs lots of attention but has a great personality.