My first saltwater was a Mantis shrimp that I kept for about two years in a 10 gallon aquarium. Her name was Shakira. Was probably the most stunning animal I've ever kept as far as coloration and interesting behaviors were concerned. Fed her krill, and goldfish. Was a very sad day when she eventually died, but by then I had the LR and tank, so I started my first 10 gallon FOWLR tank, and here we are today.