The tank is a standard size 10 gallon. with 15 pounds of live rock, on a live sand bed I know I cant expect more than 2-3 small fish, I hope that helps alot in selecting hardy fish for such a tank, also I feel the need to mention/ask what and how many crustaceons, inverts, urchins, etc would be good in such setting? again a standard 10 gallon, 15lb live rock, on live sand bed, not to be annoying but I want to give the most though info so I dont waste time, money & effort learning the hard way. seems theres not too much that is hardy when it comes to salt water, if parameters are stable, what are reliable life forms I can cohabitate happily, the more the better