I plan on starting my first marine aquarium in around a month and am just curious to see what everyone suggests I stock it with. Right now I'm hoping to get either a single Mantis Shrimp (any suggestions on species?) or some non aggressive smaller fish. Considering this will be my first attempt at salt water I'd like to get some nice, hardy, lower maintenance fish. What would you recommend? It will be either 40 or 50 gallons (probably 40) nothing larger. I am planning to have very good filtration in order to cut down on maintenance, I'm getting this sump http://www.truvuaquariums.com/mwdpss75.html and filling it with carbon, bio balls and fiber filter pads. I will supplement this with with a protein skimmer and a little live rock which I plan on adding more of as time goes on.