Succulent cactus, id please

Call it little coconut tree, I live in Thailand

Strange flowers

Once per month it has flower, all the white are waiting to get on top

Strange grown, when I bought it had fruit

Sea shells for decorating

Big shell

Shell again.

My balcony is on 12th floor, 2 hours south of Bangkok in central Pattaya, no sunshine on my side this time of year.
Normally 30°C all year,but can go down to 26°C