29 gallons is kinda ambitious for a beginner in marine the larger the better when things go wrong in marine they can really go south quick at least with a larger tank 50 gallons or more you have time to react to changing water conditions to start with youll need 1 lb of live rock per gallon of water used also a nice deep sand bed(not playground sand) is an important part of keeping nitrates down in marine you must stock your tank slowly(fish and corals) this is important due to the fact that your live rock and sand bed are used as biological filters the bacteria on them needs time to colonize in order to keep up with a larger bio load if you think getting started in marine is cheap you are wrong. just to get started with a 29 gallon tank youll drop a grand easily live rock is not cheap it ranges from 8 to 10 dollars a pound i dont say this to scare you but belive me it is the truth do some research on the cost involved before you get too involved welcome to canreef and good luck there are many fellow reefers on this forum that know way more than I do and are always willing to lend a hand
