Pico tank

My mom bought a 2.3 gallon aquarium. She is to shy to ask questions so I'm here doing it for her. She wanted to make this her adventure into saltwater and I warned her the various things that she had to deal with in such a small tank... the foot print is 17x6 and it's about 7 inches tall... she wanted to put sexy shrimp in it along with maybe a coral or 3 (maybe just a zoa garden) she hasn't made up her mind.... she also thought about adding a small goby with a max size of 1"... she wanted more opinions then just mine. So I told her I'd ask. Thanks